Unfortunately, arsenic occurs naturally in some ground water†. a mean arsenic level of μ = 8.0 parts per billion (ppb) is considered safe for agricultural use. a well in texas is used to water cotton crops. this well is tested on a regular basis for arsenic. a random sample of 36 tests gave a sample mean of x = 6.8 ppb arsenic, with s = 2.9 ppb. does this information indicate that the mean level of arsenic in this well is less than 8 ppb? use α = 0.01. (a) what is the level of significance? 0.01 state the null and alternate hypotheses. h0: μ = 8 ppb; h1: μ > 8 ppb h0: μ = 8 ppb; h1: μ < 8 ppb h0: μ > 8 ppb; h1: μ = 8 ppb h0: μ < 8 ppb; h1: μ = 8 ppb h0: μ = 8 ppb; h1: μ ≠ 8 ppb (b) what sampling distribution will you use? explain the rationale for your choice of sampling distribution. the standard normal, since the sample size is large and σ is known. the student's t, since the sample size is large and σ is unknown. the student's t, since the sample size is large and σ is known. the standard normal, since the sample size is large and σ is unknown. what is the value of the sample test statistic? (round your answer to three decimal places.) -2.483 (c) estimate the p-value. p-value > 0.250 0.125 < p-value < 0.250 0.050 < p-value < 0.125 0.025 < p-value < 0.050 0.005 < p-value < 0.025 p-value < 0.005 sketch the sampling distribution and show the area corresponding to the p-value. webassign plot webassign plot webassign plot webassign plot (d) based on your answers in parts (a) to (c), will you reject or fail to reject the null hypothesis? are the data statistically significant at level α? at the α = 0.01 level, we reject the null hypothesis and conclude the data are statistically significant. at the α = 0.01 level, we reject the null hypothesis and conclude the data are not statistically significant. at the α = 0.01 level, we fail to reject the null hypothesis and conclude the data are statistically significant. at the α = 0.01 level, we fail to reject the null hypothesis and conclude the data are not statistically significant. (e) interpret your conclusion in the context of the application. there is sufficient evidence at the 0.01 level to conclude that the mean level of arsenic in the well is less than 8 ppb. there is insufficient evidence at the 0.01 level to conclude that the mean level of arsenic in the well is less than 8 ppb.

Answers

Answer 1
Part A:

For a hypothesis test, the significant level is given by α. From the question, we were told that α = 0.01.

Therefore, the significant level is 0.01.

Our previous knowledge is that a mean arsenic level of μ = 8.0 parts per billion (ppb) is considered safe for agricultural use, we know want to know from a sample of 36 tests whether the mean level of arsenic in a particular well is less than 8 ppb.

Therefore, the null and the alternative hypothesis are:

[tex]H_0:\mu=8\ pbb \\ \\ H_a:\mu\ \textless \ 8\ pbb[/tex]



Part B:

The sampling distribution to be used is the student's t, since the sample size is large and σ is unknown.

The test statistics is given by:

[tex]t= \frac{\bar{x}-\mu}{s/\sqrt{n}} \\ \\ = \frac{6.8-8}{2.9/\sqrt{36}} \\ \\ = \frac{-1.2}{2.9/6} = \frac{-1.2}{0.4833} \\ \\ =-2.483[/tex]



Part C:

The p-value for a t-distribution test statistics of -2.483 with a degree of freedom of 35 is given by 0.0090

Thus 0.005 < p-value < 0.025



Part D:

Since the p-value is less that the significant level, we reject the null hypothesis and conclude the data are statistically significant.

i.e.
at the α = 0.01 level, we reject the null hypothesis and conclude the data are statistically significant.



Part E:

Therefore, we conclude that there is sufficient evidence at the 0.01 level to conclude that the mean level of arsenic in the well is less than 8 ppb.

Related Questions

What is the relationship between the values of the 4s in the number 4,438

Answers

4 is in the thousands and the hundreds place

The thousands place 4 is 10x larger than the hundreds place 4

hope this helps

Answer:

The leftmost 4 has a positional value of [tex]4\times10 ^ 3[/tex]. While the other 4 that appears in the displayed figure has a positional value of [tex]4\times10^2[/tex]. Then, it can be said that the relationship between the major and the minor is: [tex]\frac{4\times10 ^ 3}{4\times10 ^ 2} = 10[/tex]. That is, the relationship is that the 4 on the left is 10 times greater than the other 4 .

Step-by-step explanation:

how many liters of spring water are in six bottles if each bottle contains 0.33 liter of spring water? round your answer to the nearest liter

Answers

We know that each bottle contains 0.33 liter of spring water. If we have 6 bottles, this means that we have a total of 6*0.33 = 1.98 liters of spring water.

This we need to round the answer, we have about 2 liters of spring water.

Hope this helps! :)
You would multiply 0.33 x 6, giving you 1.98L of water.

Dots sells T-shirts ($2) and shorts ($3). In April, total sales were $576. People bought 3 times as many T-shirts as shorts.

How many T-shirts and shorts did Dots sell?

Answers

Final answer:

Dots sold 192 T-shirts and 64 shorts in April. We found this by setting up a system of equations with the given information and solving for the number of T-shirts (T) and shorts (S) sold.

Explanation:

To solve the problem of how many T-shirts and shorts Dots sold, we use a system of equations. Let's denote the number of T-shirts as T and the number of shorts as S. Given that T-shirts cost $2 each and shorts cost $3 each, and the total sales were $576, we can write our equations as follows:

2T + 3S = $576

We are also told that the store sold 3 times as many T-shirts as shorts, which gives us the second equation:

T = 3S

Substituting the second equation into the first, we get:

2(3S) + 3S = $576

6S + 3S = $576

9S = $576

Now, dividing both sides by 9 to isolate S, we get:

S = $576 / 9

S = 64

Since T is three times S:

T = 3 × 64

T = 192

Therefore, Dots sold 192 T-shirts and 64 shorts in April.

Rewrite the expression 3a^2b^3c^5/8x^4y^3z so that it has no denominator.

Answers


3a^2b^3c^5 / 8x^4y^3z
=  3/8 =.375a^2 b^3 c^5 x^-4 y^-3 z^-1

answer = .375a^2 b^3 c^5 x^-4 y^-3 z^-1

Answer: 3*2^-3a^2b^3c^5x^-4y^-3z^-1 (graded correct)

Step-by-step explanation:

meaganblatcher (original poster)

you take away 8 and multiply  and get 3a^2b^3c^5 * x^4y^3z or something

This becomes 3a^2b^3c^5x^-4y^-3z^1/8

Then you move the 8 up using multiplication and get -24a^2b^3c^5x^4y^3z^1

This can be simplifed as 3*2^-3a^2b^3c^5x^-4y^-3z^-1

regardless that's the real answer.

please show how you solve for it

Answers

Hi there! I can help you with this!

8. Okay, so the “x”’s are both on opposite sides and would both equal 180 when combined. We would set this up as 4x - 160 = 180. Add 160 to both sides to get 4x = 340. Divide each side by 4 to isolate the x. When you do that, you get 85. If you plug in the number, this is what you get:

x = 85
x angle = 85 degrees
3x - 160 = 95 degrees

Both of the sums of the angles add up to 180 degrees. Those are the answers.

9.
This one is a bit difficult. Both angles are the same measurement, so let’s do this: 182 - 4x = 5x + 2. Let’s subtract 5x from both sides. When you do, you get 182 - 9x = 2. Now, you subtract 182 from both sides. When you do, you get -9x = -180. Now, you must divide by -9 to isolate the x. When you do that, you get x = 20. Now plug in the number, and this is what you get:

x = 20
182 - 4x = 102 degrees
5x + 2 = 102 degrees

The good news is that the angle on top has the same angle measurement, so you don’t have to do much. 4y + 2 = 102. Subtract 2 from both sides to get 4y = 100. Divide each side by 4 to isolate the y. When you do that, this is the answer:

y = 25
check the picture below.

The linear equation y=3x−5y=3x−5 y equals 3 x , minus 5 is in what form.

Answers

I must make some assumptions here about what you may have meant by your "linear equation y=3x−5y=3x−5 y equals 3 x , minus 5."

You've written "y=3x-5" three times on the same line of type.  Why is that?  

Let's change what you've typed to the following:

linear equation y=3x−5

separate linear equation y     equals 3x  minus 5, or y=3x-5 

Please go back and ensure that you have copied down this problem precisely as it was originally presented.  Be careful not to duplicate info (as you did in typing "y=3x-5," followed by  "y equals 3 x , minus 5."

y = 3x - 5 is, as you say, "a linear equation."  The slope of this line is 3 and the y-intercept is (0, -5).

As to form:  This is a "slope-intercept equation of a straight line."

Other forms include "General form of the equation of a straight line," "Point-slope form."

4 students are running for club president in a club with 50 members. How many different vote counts are possible, if all 50 members are required to vote?

Answers

4 = x
50 ÷ 4= x
50 ÷ 4 = 12.5 
12.5 → 12.0 
48 ↔ 48 possible votes
The answer is 48 possible votes.

Work out: 1 - 2 + 3 - 4 + 5 - 6 + 7 - 8 + ...... + 1599 - 1600
I congratulate you if you manage to solve it!!!

Answers

[tex]1-2+3-4+5-6+7-8+1599-1600 [/tex]

Add and subtract from left to right.

[tex]1-2=-1 \ \textgreater \ -1+3-4+5-6+7-8+1599-1600 \ \textgreater \ -1+3=2 [/tex]

[tex]2-4+5-6+7-8+1599-1600 \ \textgreater \ 2-4=-2 [/tex]

[tex]-2+5-6+7-8+1599-1600 \ \textgreater \ -2+5=3 [/tex]

[tex]3-6+7-8+1599-1600 \ \textgreater \ 3-6=-3 [/tex]

[tex]-3+7-8+1599-1600 \ \textgreater \ -3+7=4[/tex]

[tex]4-8+1599-1600 \ \textgreater \ 4-8=-4 \ \textgreater \ -4+1599-1600[/tex]

[tex]-4+1599=1595 \ \textgreater \ 1595-1600 \ \textgreater \ 1595-1600=-5[/tex]

Therefore our answer is -5.

Hope this helps!

A concrete stepping stone measures 20 square inches. What is the area of 30 such stones

Answers

The answer is 600. 30•20

Find the absolute extrema of the function \(f(x)= xe^{- x^2/18}\) on the interval \([-2,4]\).

Answers

Ans : f(x)=xe^(-x^2/8) differentiating by applying product rule, f'(x)=x(e^(-x^2/8))((-2x)/8)+e^(-x^2/8) f'(x)=e^(-x^2/8)(-x^2/4+1) f'(x)=-1/4e^(-x^2/8)(x^2-4) Now to find the absolute extrema of the function , that is continuous on a closed interval, we have to find the critical numbers that are in the interval and evaluate the function at the endpoints and at the critical numbers. Now to find the critical numbers, solve for x for f'(x)=0. -1/4e^(-x^2/8)(x^2-4)=0 x^2-4=0 , x=+-2 e^(-x^2/8)=0 ,

How many elements does each of these sets have where a and b are distinct elements?
a.p({a, b,{a, b}})
b.p({∅, a,{a},{{a}}})
c.p(p(∅))?

Answers

a. [tex]\bigg|\{a,b,\{a,b\}\}\bigg|=3\implies\bigg|\mathscr P\bigg(\{a,b,\{a,b\}\bigg)\bigg|=2^3=8[/tex]

b. [tex]\bigg|\{\varnothing,a,\{a\},\{\{a\}\}\}\bigg|=4\implies\bigg|\mathscr P\bigg(\{\varnothing,a,\{a\},\{\{a\}\}\}\bigg)\bigg|=2^4=16[/tex]

c. [tex]|\varnothing|=0\implies\bigg|\mathscr P(\varnothing)\bigg|=2^0=1\implies\bigg|\mathscr P(\mathscr P(\varnothing))\bigg|=2^1=2[/tex]

What is the median of 26, 30, 24, 32, 32, 31, 27, and 29? 32 29 30 29.5?

Answers

First put both in other 
24,26,27,30,31,32,32 = 30
29,29,29.5,30,32  =29.5

add them together 
=59.5

or if your question is all the numbers together 
24,26,27,29.5,29,29,30,30,31,32,32,32= 29+30
= 29.9

To find the median, sort the numbers in ascending order and average the two middle values. The median of the given numbers is 29.5.

To find the median of the numbers 26, 30, 24, 32, 32, 31, 27, and 29, follow these steps:

First, arrange the numbers in ascending order: 24, 26, 27, 29, 30, 31, 32, 32.Since there are 8 numbers (an even number), the median will be the average of the 4th and 5th numbers in this sorted list.The 4th number is 29 and the 5th number is 30.The median is therefore (29 + 30) / 2 = 29.5.

Thus, the median of the given set of numbers is 29.5.

what is 107,609 divided by 72 with a remainder with no decimal?

Answers

107,609 / 72 = 1494.56....this is the calculator answer

72 * 1494 = 107,568
107,609 - 107,568 = 41 <== ur remainder

What is the value of s 0.7(3s+4)-1.1s=7.9

Answers

The value of 's' in this equation is 51/10, / 5.1

(mark as brainliest if you can) ☺

On a winter day in Alaska, the temperature at noon was -0.6°C. From noon to 3:00, the temperature increased by 1.2°C. From 3:00 to 6:00, it dropped 0.4°C, and from 6:00 to 9:00, it decreased by 0.6°C. What expression shows the temperature in °C at 9:00 p.m.?

Answers

The expression is -6 + 1.2 + -0.4 + -0.6


At 9:00 p.m, the temperature would be equal to -0.4°C

How are Kelvin, Celsius, and Fahrenheit related?

We have got an equation that can relate these three units of measurement of temperature, as given below:

[tex]\dfrac{C}{5} = \dfrac{F - 32}{9} = \dfrac{K - 273}{5}[/tex]

where C represents the measurement of a fixed temperature in celsius, F represents the measurement of that same intensity temperature in fahrenheit, and K represents the measurement of equally intense temperature in kelvin.

We are given that

On a winter day in Alaska, the temperature at noon = -0.6°C.

Then From noon to 3:00, the temperature increased by 1.2°C. From 3:00 to 6:00, it dropped 0.4°C, and from 6:00 to 9:00, it decreased by 0.6°C.

-0.4

Therefore, the expression could be;

-0.6+1.2-0.4-0.6

=-0.4

The expression that shows the temperature in °C at 9:00 p.m is -0.6+1.2-0.4-0.6

Learn more about temperature scale here:

https://brainly.com/question/2919967

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Gerard bought 9 hamburgers and 3 orders of fries for 24.75. Chris bought 6 hamburgers and 4 orders of fries for 19.50. Each hamburger cost the same amount. Each Order of fries cost the same amount. Wrote a system of equations that can be used to find how much one hamburger and one Order of fries cost.

Answers

9h + 3f = 24.75....multiply by 4
6h + 4f = 19.50 ...multiply by -3
----------------------
36h + 12f = 99 (result of multiplying by 4)
-18h - 12f = - 58.50 (result of multiplying by -3)
--------------------add
18h = 40.50
h = 40.50/18
h = 2.25  <== hamburgers cost 2.25 each

6h + 4f = 19.50
6(2.25) + 4f = 19.50
13.50 + 4f = 19.50
4f = 19.50 - 13.50
4f = 6
f = 6/4
f = 1.50 <== fries cost 1.50 per order

Answer:

System of equations:

9x+3y=24.75

6x+4y=19.50

x: cost of a hamburger

y: cost of an order of fries

Step-by-step explanation:

We define the variables of the system of equations:

x: cost of a hamburger

y: cost of an order of fries

We propose the system of equations:

To Gerard:  9x+3y=24.75

To Chris:      6x+4y=19.50

where, the coefficients in the equations represent the quantity that was purchased from each product and the variables represent the costs of each product.

simplify (7x−13)−(x+5)

Answers

Greetings!

Simplify.
[tex](7x-13)-(x+5)[/tex]
Distribute the Parenthesis.
[tex]7x-13-x-5[/tex]
Combine Like Terms.
[tex]7x-x-13-5[/tex]
[tex]6x-18[/tex]

Hope this helps.
-Benjamin
6x-18



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(1 pt) let x be an exponential random variable with parameter \lambda = 4, and let y be the random variable defined by y = 2 e^x. compute the probability density function of y:

Answers

[tex]Y=2e^X\iff X=\ln\dfrac Y2[/tex]

Note that [tex]x\in[0,\infty)[/tex], so that [tex]y\in[2,\infty)[/tex].

[tex]F_Y(y)=\mathbb P(Y\le y)=\mathbb P(2e^X\le y)=\mathbb P\left(X\le\ln\dfrac y2\right)=F_X\left(\ln\dfrac y2\right)[/tex]

[tex]F_X(x)=1-e^{-4x}[/tex]
[tex]\implies F_Y(y)=1-e^{-4\ln\frac y2}=1-\dfrac{16}{y^4}[/tex]

[tex]\implies f_Y(y)=\dfrac{\mathrm dF_Y(y)}{\mathrm dy}=\dfrac{64}{y^5}[/tex]

1.all real numbers that are less than -3 or greater than or equal to 5
A.x < -3 or x≥5
B.x < 5 or x ≥-3
C.x ≤ -3 or x >5
D.x ≤-3 or x ≤ 5

2.The time a cake must bake is between 25 minutes and 30 minutes, inclusive.
A.25 < x < 30
B.25 ≤ x ≤ 30
C.25 ≤x ≥ 30
D.25 < x > 30

3. Solve. 5 < x -2 <11
A.5 < x < 11
B.7 < x < 13
C.7 < x < 11
D.5 < x < 16

4. Which graph shows the solution of 9 - c < 2 or -3c > 15?

Answers

Answer:

Kramer is wrong trust me

The answers are:

1. A

2. B

3. B

4. C

100% just took it :)

Lesson 6 - Compound inequalities

Step-by-step explanation:

a=9y+3yx solve for y

Answers

the answer is y= a/3(3+x)

Answer:

[tex]y=\frac{a}{(9+3x)}[/tex]

Step-by-step explanation:

we have

[tex]a=9y+3yx[/tex]

Solve for y

That means -----> isolate the variable y

Step 1

Factor the variable y in the right side

[tex]a=y(9+3x)[/tex]

Step 2

Divide by [tex](9+3x)[/tex] both sides

[tex]a/(9+3x)=y(9+3x)/(9+3x)[/tex]

Step 3

Simplify

[tex]y=\frac{a}{(9+3x)}[/tex]



Change 5 2/3 to a mixed decimal and round to the nearest hundredth.

Answers

The Decimal Is 5.666667 so your answer is 6
So change 5 2/3 to a decimal and round correct? We can see the whole number is 5 so 5. now turn 2/3 to a decimal by dviding 2/3 = . 666 now add 5 and .666 together we get 5.666 but it wants us to round to the nearest hundredths so 5.67 

to change 5 2/3 to a mix fraction, we times 3 x 5 = 15 then add the numerator so 15 + 2 = 17 and we get 17/3 and now we divide 17/3 to get our decimal, which is 5.67

a pail holds 4 4/1 gallons of water.How much is this in cups

Answers

Final answer:

To convert gallons to cups, multiple conversion factors can be used. Assuming a typo in '4 4/1 gallons' and correcting it to '4 gallons,' the conversion shows that there are 16 cups in a gallon. Thus, 4 gallons of water is equivalent to 64 cups.

Explanation:

To convert gallons to cups, you can use conversion factors that relate these two units of volume. First, we need to correct the expression given for the volume of water in the pail. It seems there is a typo because '4 4/1 gallons' isn't a proper number. Assuming it's intended to be '4 gallons,' we can proceed with the conversion.

Since 1 gallon is equivalent to 4 quarts and 1 quart is equivalent to 2 pints, and 1 pint is equivalent to 2 cups, we can create a chain of multiplications to convert from gallons to cups.

1 gallon = 4 quarts1 quart = 2 pints1 pint = 2 cups

Multiplying these together gives us:

1 gallon = 4 x 2 x 2 = 16 cups

Therefore, to find out how many cups are in 4 gallons:

4 gal x 16 cups/gal = 64 cups

So, 4 gallons of water is equivalent to 64 cups.

Final answer:

To convert 4 gallons to cups using the provided conversion factors, multiply the gallons by 4 to get quarts, then multiply by 2 to get pints, and again multiply by 2 to get cups, resulting in a total of 64 cups.

Explanation:

The student's question involves converting a quantity of gallons into cups, which is a Mathematics problem specifically dealing with units of volume conversion. The amount given, 4 4/1 gallons, seems to be a typo, but assuming the intention was to convert 4 gallons into cups, we can use the given conversion factors:

1 gallon = 4 quarts1 quart = 2 pints1 pint = 2 cups

To find out how many cups are in 4 gallons, we follow these steps:

Multiply the number of gallons by 4 to convert gallons to quarts.Since 1 gallon is equal to 4 quarts, 4 gallons is equal to 4 x 4 quarts, which is 16 quarts.Since 1 quart is equal to 2 pints, we can then convert quarts to pints by multiplying the number of quarts by 2.16 quarts is equal to 16 x 2 pints, which is 32 pints.Finally, since 1 pint is equal to 2 cups, to convert pints to cups, multiply the number of pints by 2.32 pints is equal to 32 x 2 cups, which equals 64 cups.

Therefore, 4 gallons is equivalent to 64 cups.

It takes 40 min for a bus to travel the 36 miles from Framingham to Worcester. A car traveling from Worcester to Framingham moves 1.5 times as fast as the bus. If the car and the bus start moving towards each other simultaneously, after how many minutes will they meet?

Answers

Bus is moving: 40min / 60 min = 2/3 hr 36 is 2/3 speed in mph (miles per HOUR) 36 / (2/3) = 54 mph Car is 54 x 1.5 mph = 81 mph 81/60 = 1.35 miles / min & 54/60 = 0.9 mph In one minute they both cover 2.25 miles 36 miles / 2.25 miles = 16 minutes will have passed when they meet!

The answer is 16 mins

The ratio of the height to the width of a packaging label is 5 to 19. If the height of the label is 2 inches, what is its width? HINT: Set up and solve as a proportion and find x.

Answers

Height/width=5/19
5/19=2/x
(5)(x)=(19)(2)
5x=38
5/5x=38/5
x=38/5in or 7.6in

Answer:

7.6 inches

Step-by-step explanation:

The ratio of the height to the width of a packaging label is 5 to 19, that is,

h/w = 5/19 [1]

If the height of the label is 2 inches, and its width is unknown (x), that is,

h/w = 2 in/x [2]

We can set up a proportion with [1] and [2],

5/19 = 2 in/x

We use the cross product property of proportions.

5 × x = 19 × 2 in

x = 19 × 2 in/ 5 = 7.6 in

The width is 7.6 inches.

if a debt of $480 is reduced by 20% find the new debt

Answers

Final answer:

To find the new debt after a 20% reduction, subtract 20% of the original debt from the original debt.

Explanation:

To find the new debt after a 20% reduction, we need to subtract 20% of the original debt from the original debt. Here's how to calculate it:

Convert 20% into a decimal by dividing it by 100: 20% = 0.20Multiply 0.20 by $480 to find the reduction amount: 0.20 x $480 = $96Subtract $96 from $480 to find the new debt: $480 - $96 = $384

Therefore, the new debt after a 20% reduction is $384.

Final answer:

The new debt after being reduced by 20% is $384.

Explanation:

To find the new debt after it has been reduced by 20%, we can use the following steps:

Calculate 20% of $480 by multiplying 480 by 0.20. 20% of 480 is $96.Subtract the amount calculated in step 1 from the original debt. The new debt is $480 - $96 = $384

Therefore, the new debt after being reduced by 20% is $384.

the amount of money in an account with continuously compounded interest is given by the formula A = Pert, where P is the principal, r is the annual interest rate, and t is the time in years. Calculate to the nearest tenth of a year how long it takes for an amount of money to double if interest is compounded continuously at 5.2%. 5.9 years 13.3 years 1.3 years 0.6 years

Answers

2=e^.052t
ln 2=ln e^0.052t=0.052t ln e=0.052t
t=(ln 2)/0.052=13.33 years
☺☺☺☺

A chemist has two large containers of sulfuric acid solution, with different concentrations of acid in each container. Blending 305 mL of the first solution and 580 mL of the second gives a mixture that is 10.24% acid, whereas blending 85 mL of the first mixed with 490mL of the second gives a 6.10% acid mixture. What are the concentrations of sulfuric acid in the original containers?

Answers

 A is the concentration of the first container, B the second container.

300a+600b=900·(15)=13500
1.3a+6b=135

100a+500b=600·(12.5)=7500
2.a+5b=75

Multiply eq. 2 by (-3) and add to eq. 1 to eliminate A.
3a+6b-3a-15b=135-225
-9b=-90
b=10
Then from eq. 2,
a+50=75
a=25
The first container is a 25% solution and the second container is a 10% solution

The concentrations of sulfuric acid in the original containers as per the system of equation is equals to 24% in first container and 3% in second container.

What is system of equation?

" A system of equations is finite set of equations for which we find the common solution."

According to the question,

'a' represents the concentration of acid in first container

'b' represents the concentration of acid in second container

Situation1: 305 mL of the first solution and 580 mL of the second gives a mixture that is 10.24% acid, it represents the equation as,

 a% of 305 + b% of 580 = 10.24% of 885

⇒ 305a + 580b = 9062.4                              _______(1)

Situation 2:85 mL of the first mixed with 490mL of the second gives a 6.10% acid mixture, it represents the equation as,

a% of 85 + b% of 490 = 6.10% of 575

⇒ 85a + 490b = 3507.5                                           ______(2)

Solve system of equation by multiplying  (1) by 85 and (2) by 305 we get,

25925a + 49300b = 770303                      _______(3)

25925a + 149450b = 1069787.5                _______(4)

Subtract  system of equation  (3) from (4) we get,

100150b = 299483.5

⇒ b = 2.9

⇒ b≈ 3%

Substitute the value of 'b' in (2) we get,

85a + 490(3) = 3507.5

⇒85a + 1407 = 3507.5

⇒ 85a = 2037.5

⇒ a = 23.9

⇒ a ≈24%

Hence, concentration of sulfuric acid in first container 24% and second container 3% as per the system of equation.

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PLEASE HELP!!! WILL BRAINLIEST

Jane ran 3/8 of the distance that Jack ran. If Jane ran 2/3 of a mile, how far did Jack run?

Which of these could be used to solve the problem?

A. 3/8 * = 2/3
B. 2/3 * = 3/8
C. x=(2/3) (3/8)
D. x=3/8 *- 2/3*

Answers

B is wrong the answer is A

Using proportions, it is found that the distance that Jack ran is given by:

A. [tex]\frac{3}{8}x = \frac{2}{3}[/tex]

The distance ran by Jane was of [tex]\frac{2}{3}[/tex] of a mile.This distance was also [tex]\frac{3}{8}[/tex] of the distance ran by Jack, which is given by x.

Applying the proportion, we have that [tex]\frac{3}{8}[/tex] multiplied by x is equals to [tex]\frac{2}{3}[/tex], hence:

[tex]\frac{3}{8}x = \frac{2}{3}[/tex]

Which means that the correct option is given by a.

A similar problem, also involving proportions, is given at https://brainly.com/question/24372153

The equation of the line in this graph is y=____x+____

Answers

y = mx + b

where y is y
m = slope
x = x
b = y intercept

hope this helps

y=mx+b m is the slope and b is the y intercept

An arrow is shot vertically upward from a platform 25ft high at a rate of 172⁢ft/sec. When will the arrow hit the ground?

Answers

Hello,


h= -16t^2+185t+10, h = 0 when it hits the ground
16t^2+185t+10 = 0
t = 11.6sec (to nearest tenth)


Hope this helps
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