HELP!
Data Set #6-Number of students in 7th grade Math live session 45,52,60,40,35,28,40,54,58
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For this system of equation I used substitution:

Step 1: Every time you see a y in the equation y = 2x - 1 replace it with -4x - 19

-4x - 19 = 2x - 1

Step 2: Isolate x

(-4x + 4x) - 19 = (2x + 4x) - 1

-19 = 6x - 1

-19 + 1 = 6x + (- 1 + 1)

-18 = 6x

x = -3

Step 3: To solve for y replace x in the equation y = 2x - 1 with -3

y = 2(-3) - 1

y = -6 - 1

y = -7

(-3, -7)

Check:

-7 = -4(-3) - 19

-7 = 12 - 19

-7 = -7 --------------------------------> Correct!

-7 = 2(-3) - 1

-7 = -6 - 1

-7 = -7 --------------------------------> Correct!

Hope this helped!

I think the answer is 3/10

The probability that we will get a lead role, given that we are chosen to be in the play is 0.5.

Probability is the ratio that shows the likelihood of an event occurring from a given set of possible events.

The probability that we will be chosen for the play is 0.4.

The probability that we will get the lead role is 0.1.

We have to find the probability that we get a lead role, given that we are already chosen to be in the play.

In this situation, the probability can be found by adding the probability of being chosen and the probability that we will get the lead role.

This can be done as shown below:

The probability that we get a lead role, given that we are already chosen to be in the play = The probability that we will be chosen for the play + The probability that we will get the lead role

= 0.4 + 0.1

= 0.5

The probability of us getting a lead role given that we have already been chosen for the play is found to be 0.5. The correct answer is option D.

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First we must find area of a single square.

Meaning we divide total area of 80 centimetres squared by 5 since we have 5 squares in the shape.

[tex]A_{square}=\frac{A_{shape}}{5}=\underline{16}[/tex]

Now from the picture we can see that the perimeter of shape is combined by 4 times 3 times the length of side of 1 square.

So we need to find side of 1 square.

[tex]a=\sqrt{A_{square}}=\sqrt{16}=\underline{4}[/tex]

As we stated before the formula for perimeter of this shape is:

[tex]P=4(3\cdot a)=4(3\cdot4)=4\cdot12=\boxed{48}[/tex]

The perimeter of shape is 48 centimetres.

Hope this helps.

r3t40

Answer:

19.5

Step-by-step explanation:

just look at the equation like this

1 1/2 - 1/4

???? - 3 1/4

divide 3 1/4 by 1/4 and multiply the result by 1 1/2

or just treat it as a ratio

1.5/x=.25/3.25

Answer:

a . is the right answer

trust me

We find out the number of lemons needed per cup by dividing the total number of lemons by the total number of cups. In this case, 18 lemons divided by 15 cups gives us the number of lemons used per cup of lemonade.

This question is asking how many lemons are required for each cup of lemonade if 18 lemons are used to make 15 cups of lemonade. This is a simple proportional math problem. To solve this, we divide the total number of lemons by the total number of cups.

Step 1: Identify the total number of lemons and cups, which are 18 and 15 respectively.

Step 2: Divide the total number of lemons by the total number of cups (18 lemons / 15 cups).

Step 3: The solution will show the number of lemons used per cup of lemonade.

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Answer:

8 laps

Step-by-step explanation:

Assuming in the equation given than n represents the number of laps run and t represents the time in minutes, when we plug in 16 in for t and simplify we get:

n=5/10*16

n=1/2*16 (Simplify the fraction by dividing top and bottom by 5)

n=16/2 (Multiply the fractions together by writing 16 as 16/1 and multiplying straight across)

n=8

Answer:

8

Step-by-step explanation:

This question is a bit of a guess. You have to assume that n is in laps and that t  is in minutes.

n = (5/10) * t Reduce 5/10 to 1/2

n = 1/2 * 16

n = 8

So if the assumptions are correct, he should be able to do 8 laps.

A rectangle is a 4-sided flat shape with straight lines where all interior angles are rights angles (90°)

A shape that has two long sides &’ two short sides .

The amount of Thorium-228 left after 22.8 years of decay from an initial 50 gram sample, given its half-life of 1.9 years, is 0.124 grams.

In this problem of thorium -228 decay, we apply the formula for exponential decay which is A=A0e^-kt. 'A0' represents the initial amount, which in this case is 50 grams. 'A' is the final amount after 't' years, and 'k' is the decay constant. To find the decay constant first, we note that thorium-228 decays to 50% of its initial quantity in 1.9 years. Therefore, we can write the equation 0.5=A0e^-1.9k. Solving for 'k', we get k = ln(2)/1.9, which allows us to derive the time constant for the decay.

Now we use this value of 'k' to find out the amount of thorium-228 left after 22.8 years. Plugging the values into our formula, we get: A = 50e^((ln2/1.9)*-22.8). Solving this yields a value of 0.124 grams, which means option C is correct.

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To find the amount of thorium-228 remaining after 22.8 years, we can use the formula A = A0e -kt. The correct answer is B) 30.32 grams.

To solve this problem, we can use the formula A = A0e-kt where A is the amount of the substance at a given time, A0 is the initial amount, k is the decay constant, and t is the time elapsed.

In this case, we are given that thorium-228 decays 50% every 1.9 years.

This means that the decay constant k = ln(2)/1.9. We can substitute the values into the formula and solve for A: A = 50 * e(-ln(2)/1.9)*22.8 = 30.32 grams.

Therefore, the correct answer is B) 30.32 grams.

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Answer:

7.76(x) / 4 = Total cost

$25.22

Step-by-step explanation:

Given in the question that,

number of glue sticks that cost $7.76 = 4

To find the cost of 13 glue sticks first we need to find the cost of one glue stick, for that we will need cost of 4 sticks with 4

4    ---->    $7.76

1     ---->    $7.76/4

                $1.94

Multiply the cost of 1 glue with 13

3  ----->    $1.94x13

               $25.22

Equation

where x represent number of glue sticks

Subtract the 30 feet from the overall height:

325 - 30 = 295

The height of the drop is 295 feet.

Answer:

295 hope this helps!!

Step-by-step explanation:

Answer: 544 ft²

Step-by-step explanation: 17*32=544 and ft*ft=ft² so it is 544 ft²

Answer:

P(A)= 21/36

P(B)=1/2

Step-by-step explanation:

Given:

An ordinary Fair die is a cube with the numbers 1 through 6 on the sides represented by painted spots imagine that such a die is rolled twice

So the sample space of rolling two dices is:

(1,1) (2,1) (3,1) (4,1) (5,1) (6,1)

(1,2) (2,2) (3,2) (4,2) (5,2) (6,2)

(1,3) (2,3) (3,3) (4,3) (5,3) (6,3)

(1,4) (2,4) (3,4) (4,4) (5,4) (6,4)

(1,5) (2,5) (3,5) (4,5) (5,5) (6,5)

(1,6) (2,6) (3,6) (4,6) (5,6) (6,6)

Total number of sets=36

1)Now Finding probability of

Event A: The sum is greater than 6

From the above sample space sets that have the sum >6 are

(6,1)

(5,2) (6,2)

(4,3) (5,3) (6,3)

(3,4) (4,4) (5,4) (6,4)

(2,5) (3,5) (4,5) (5,5) (6,5)

(1,6) (2,6) (3,6) (4,6) (5,6) (6,6)

there are 21 sets

hence probability of Event A= 21/36

P(A)= 21/36

2) Now Finding probability of

Event B: The sum is an odd number

From the above sample space sets that have the sum an odd number are

(2,1)(4,1) (6,1)

(1,2)(3,2) (5,2)

(2,3) (4,3)(6,3)

(1,4) (3,4) (5,4)

(2,5) (4,5) (6,5)

(1,6) (3,6) (5,6)

there are 18 sets

hence the probability of Event B = 18/36

         P(B)= 1/2 !

Answer:

$4999

Step-by-step explanation:

Let the cost of the car be x

Then considering 20% markup, the sticker price is:

Since 20% of x is 20/100x = 0.2x,

So dealer paid $4999 for the car

2/3 - Red

4/21 - Blue

Change the red fraction so both fractions will have the same denominator

2/3 change to 14/21

Add blue and red together

14/21 + 4/21 = 18/21

Then subtract it from the total to get the white beads

21/21 - 18/21 = 3/21

Simplify it to get 1/7

Ans : 1/7

Fraction of white beads used is 1/7.

A number expressed as a quotient, in which a numerator is divided by a denominator.

Given:

red beads used = 2/3 = /1

blue beads used = 4/21

Total beads other than white

=14/21 + 4/21

= 18/21

N/ow, fraction of the beads should be white

=1- 18/21

=21/21 - 18/21

=3/21

=1/7

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Answer:

29000, with the margin of error of ±5000

Step-by-step explanation:

Margin of error is the amount of error that can be caused due to variation, change of circumstances or any miscalculation.

In given case value of college student's debt can be between

24000 and 34000

Finding mid-point

(24000+34000)/2

29000

Now finding deviation of 29000 from 24000 and 34000

24000-29000= -5000

34000-29000= 5000

Hence

29000, with the margin of error of ±5000 !

Answer:

The midpoint is (9,6)

Step-by-step explanation:

The midpoint is just the average of the two end points.

x: (5 + 13)/2 = 18/2 = 9

y: (1 + 11)/2 = 12/2 = 6

The midpoint is (9,6)

Answer:

(5 1/2, 1), ( 5 1/2, 2) and (5 1/2, 3).

Step-by-step explanation:

The x coordinates will all be 5 1/2 so we could have 3 points with coordinates:

(5 1/2, 1), ( 5 1/2, 2) and (5 1/2, 3).

Answer:

[tex] \sqrt{ \frac{13}{16} } [/tex]

Step-by-step explanation:

[tex]cos \: theta = \frac{ \sqrt{3} }{4} \\ sin \: theta = \sqrt{1 - {cos}^{2} theta} \\ = \sqrt{1 - {( \frac{ \sqrt{3} }{4} ) }^{2}} \\ = \sqrt{1 - \frac{3}{16}} \\ = \sqrt{ \frac{13}{16} } [/tex]

Answer:

see explanation

Step-by-step explanation:

Using the trigonometric identity

• sin²x + cos²x = 1 ⇒ sin x = ± [tex]\sqrt{1-cos^2x}[/tex]

Since sinΘ < 0 , then

sinΘ = - [tex]\sqrt{1-(\frac{\sqrt{3} }{4})^2 }[/tex]

       = - [tex]\sqrt{1-\frac{3}{16} }[/tex]

      = - [tex]\sqrt{\frac{13}{16} }[/tex] = - [tex]\frac{\sqrt{13} }{4}[/tex]

Answer:

The expression that represent the volume of the prism is  [tex]\frac{1}{2}x^{3}[/tex]

Step-by-step explanation:

we know that

The volume of the prism is equal to

[tex]V=LWH[/tex]

In this problem we have

[tex]L=x\ units[/tex]

[tex]W=x\ units[/tex]

[tex]H=(1/2)x\ units[/tex]

substitute

[tex]V=(x)(x)(1/2)x=\frac{1}{2}x^{3}\ units^{3}[/tex]

Answer:

Its the first one

Step-by-step explanation:

For this case we have that if "y" varies directly with "x", we can propose:

[tex]y = kx[/tex]

Where "k" represents the constant of proportionality.

According to the data:

[tex]180 = kn\\n = k5[/tex]

We substitute the second equation in the first:

[tex]180 = k * k5\\180 = 5k ^ 2\\k ^ 2 = \frac {180} {5}\\k ^ 2 = 36[/tex]

We apply root:

[tex]k = \pm \sqrt {36}\\k = \pm6[/tex]

If k = 6, then[tex]n = 6 * 5 = 30[/tex]

Answer:

[tex]n = 30[/tex]

Answer:

EDGE 2020

Step-by-step explanation:

C) 30

trust me

Hi there! The answer you're looking for is $72.30. Simply multiply $482 by 0.05 (5%) and multiply that answer by three (three years) to get $72.30! Let me know if this helps! <3

Answer: $72.30

Step-by-step explanation: To solve this problem, first begin with the interest formula.

Formula: Interest = principal × rate × time

In this problem, we are solving for the interest.

The principal is the amount invested which in this case is $482. The rate is 5% which we can write as .05 and the time is 3 years.

Interest = (482)(.05)(3)

Interest = 72.3

This means that the interest earned is $72.30.

I got you fam!

Here's what I worked out for you:

1. Answer is C (-3, -5)

2. Answers are C and D (5, -1)

3. Answers are A and B (0, 3)

I'm one Brainliest away from ranking up, so one would be super appreciated! Thanks and good luck!

By determining the proportion of classmates who prefer green and applying it to the entire school population, we predict that approximately 72 students at the school would choose green as their favorite color.

To predict the number of students who favor green as their favorite color, we will assume the sample of classmates is representative of the entire school.

First, we need to find out how many students in the class chose green as their favorite color. Say, for example, 4 of the 22 classmates picked green. To find the predicted number for the school, we calculate:

Number of green-favoring classmates / Total classmates = Proportion of green-favoring classmates

4 / 22 = 0.1818 (rounded to four decimal places).

Now, apply this proportion to the entire school population:

0.1818 × 396 = Predicted number of students who favor green at the school.

71.55 - Since we can't have a fraction of a student, we round to the nearest whole number, predicting that about 72 students in the school would choose green as their favorite color.

Based on the data provided, I predict that approximately 72 students in the school would choose green as their favorite color.

1. Since you surveyed 22 classmates, the percentage of classmates who prefer green can be calculated. Let's assume that [tex]\( x \)[/tex] represents the number of classmates who prefer green. Therefore, [tex]\( \frac{x}{22} \)[/tex] is the proportion of classmates who prefer green.

2. Now, we can use this proportion to estimate the total number of students in the school who prefer green. Since there are 396 students in total, the estimated number of students who prefer green would be[tex]\( \frac{x}{22} \times 396 \).[/tex]

Now, let's find [tex]\( x \):[/tex]

- Let's assume [tex]\( y \)[/tex] is the number of classmates who prefer green. Since you surveyed 22 classmates, the percentage of classmates who prefer green can be calculated as [tex]\( \frac{y}{22} \).[/tex]

- Assuming that the number of classmates who prefer green is proportional to the total number of students who prefer green in the school, we can set up a proportion: [tex]\( \frac{y}{22} = \frac{x}{396} \).[/tex]

- Cross-multiplying, we get [tex]\( 396y = 22x \).[/tex]

- Solving for [tex]\( x \),[/tex] we find [tex]\( x = \frac{396y}{22} \).[/tex]

- Since we don't know the exact number of classmates who prefer green, let's assume a hypothetical scenario where 4 of your classmates prefer green. So, [tex]\( y = 4 \).[/tex]

- Substituting [tex]\( y = 4 \)[/tex] into the equation, we get [tex]\( x = \frac{396 \times 4}{22} = \frac{1584}{22} = 72 \).[/tex]

By surveying your classmates, you get a sample proportion of those who prefer green. Extrapolating this proportion to the entire school population, you can estimate the total number of students who prefer green. However, this estimation assumes that your classmates' preferences are representative of the entire school's preferences. So, based on this calculation, approximately 72 students in the school are predicted to choose green as their favorite color.

Complete question:

You survey your 22 classmates on there favorite color. There are 396 students at your school. How many students in the school do you predict would choose green as there favorite color?

Answer:

3x-15

Step-by-step explanation:

(x-10)+(x-5)+(x)=3x-15

3x - 15

Simply add the different container sizes together. The first container holds x - 10 liters, the second holds x - 5 liters, and the third holds x liters.

(x - 10) + (x - 5) + x

Because of the associative property of Addition, we can remove the parentheses.

x - 10 + x - 5 + x

Because of the communicative property of addition, we can reorder the terms so that the like terms are next to each other.

x + x + x - 10 - 5

Now, combine the x’s.

3x - 10 - 5

Finally, subtract -10 minus - 5.

3x - 15

Answer:

A. [tex]\frac{3}{7}[/tex]

Step-by-step explanation:

The given equation is

[tex]3x-7y=14[/tex]

We solve for y by  subtracting 3x from both sides to obtain;

[tex]-7y=14-3x[/tex]

We now divide through by -7 to get;

[tex]y=\frac{-3}{-7}x+\frac{14}{-7}[/tex]

This simplifies to;

[tex]y=\frac{3}{7}x-2[/tex]

This equation is now in the form y=mx +c, where [tex]m=\frac{3}{7}[/tex] is the slope.

Answer:

x=-5   x=-4

Step-by-step explanation:

y=x^2 + 9x + 20

We need to factor the equation

What 2 numbers multiply to 20 and add to 9

4*5 = 20

4+5 =9

y=(x+5) (x+4)

To find the zero's we set the equation equal to zero

0= (x+5) (x+4)

Using the zero product property

x+5 = 0   x+4=0

x=-5   x=-4

Answer:

[tex]\large\boxed{A.\ -10x^2-33x+1}[/tex]

Step-by-step explanation:

[tex]6x(x-4)-16x^2-(9x-1)\qquad\text{use the distributive property}\\\\=(6x)(x)+(6x)(-4)-16x^2-9x-(-1)\\\\=6x^2-24x-16x^2-9x+1\qquad\text{combine like terms}\\\\=(6x^2-16x^2)+(-24x-9x)+1\\\\=-10x^2-33x+1[/tex]

The expression simplifies to -10x^2 - 33x +1, following the distribution and combination of like terms.

The given question asks to simplify the expression 6x(x − 4) − 16x2 − (9x − 1). To solve, we follow these steps:

Therefore, the correct option is A. -10x2 − 33x + 1.

Answer:

Linear Positive Association

Step-by-step explanation:

Since you're looking for the volume of each...

Circle: you want to find the area (πr^2) times height

Rectangle: l×w×h