Mathematics Middle School

Nora took 8 bottles of water to a picnic. Of those bottles of water, she and her friends opened a certain number of bottles. b. What expression can be used to determine the number of unopened bottles at the end of the picnic?

A. 8+b
B. B+8
C.8-b
D.b-8

Answers

Answer 1
Problem
Nora took 8 bottles of water to a picnic. Of those bottles of water, she and her friends opened a certain number of bottles. What expression can be used to determine the number of unopened bottles at the end of the picnic?

Result
C. 8 - b

Solution
I strongly recommend that you try to find the reason why the answer is the way it is. 
Answer 2

Final answer:

To calculate the number of unopened bottles after some have been opened, subtract the number of opened bottles (b) from the total number brought to the picnic (8), resulting in the expression 8 - b.

Explanation:

The expression to determine the number of unopened bottles of water at the end of the picnic, when Nora took 8 bottles and a certain number of bottles were opened, would be 8 - b. Here, the variable b represents the number of bottles that were opened, and since we start with 8 bottles, we subtract the number that were opened (b) from the total number of bottles (8) to get the number that remain unopened.

Related Questions

what is the slope intercept form of the linear equation 4x + 2y = 24
drag and drop the appropriate number, symbol, or variable to each box

Answers

The answer is: y = -2x+12

4x+2y=24=

4x-4x+2y=24-4x=

2y=24-4x

Divide each piece by 2=

2y/2=24/2-4x/2

y=12-2x

But, slope intercept form is y=mx + b so you must put the second part in reverse, making the answer to the equation be y=-2x+12
(Don't forget the - on -2)

The probability that your ticket will be chosen in a drawing is 16%. There are 125 tickets in the drawing. How many tickets are yours?

Answers

You need to find 6% of 250. To do that, change 6% to a decimal (0.06) and multiply that by 250. That answer is how many tickets you have.

6%=0.06

250
x0.06
______
15.00.       move the decimal point in 2 spaces

15
Final Answer: 15 tickets are yours.
Total number of tickets is= 125
Percentage of your ticket is= 16%
To find the number of your tickets= 16% x 125
                                                     = 20
So, 20 tickets are yours

In order to paint your bedroom, you buy 2 gallons of paint that cost $10.50 each, 3 paint brushes that cost $2.99 each, and 2 paint rollers that cost $1.25 each. Write an expression to model this situation. Then use the Distributive Property to find the total cost.

Answers

444141416416156116515561

Which function will produce the same graph as the function shown below? Y = (x - 1)(x - 3) Multiple answers may be correct.
y=x^2+2x+3
y+3=x(x-1)
y=x^2-4x+3
y-3=(x-1)^2

Answers

Answer:

On Apex Learning, the correct answer is C.

Step-by-step explanation:


By noon, the temperature increased 21 from the morning low -13 what was was the tempature noon

Answers

-13+21=14
The temperature is 14 degrees during your afternoon.

In a recent survey 0.4 of the people surveyed said their favorite food was pizza 25% said it was hot dogs and 3/10 said it was popcorn, which food was favored by the greatest number of people

Answers

Pizza I think, but I might have done the math wrong. 

Answer:

Step-by-step explanation:

It would be pizza since it is 40% of the people

What is 17/18 minus 2/3

Answers

the answer would be 0.27777777777
2/3 = 12/18
17/18 - 12 / 18 = 5/18
The answer is 5/18.

Kelly formed 7 equal groups out of 4.27 pounds of food find the number of pounds in each group

Answers

4.27/7= 0.61


Each group received 0.61 pounds of food.

Hope this helps!

Find the domain and range of x + y = 1. Then determine whether it is a function.

Answers

The domain is all real numbers and the range is all real numbers.
(-∞, ∞) for both.

It is a function.
Final answer:

The domain and the range of the equation x + y = 1 are both all real numbers. The equation is a function since each x-value corresponds to a unique y-value.

Explanation:

The question is asking us to find the domain and range of the equation x + y = 1, and to determine whether it is a function.

The domain of an equation is the set of all possible x values. For this equation, we can substitute any real number for x, therefore, the domain is all real numbers.

The range of an equation is the set of all possible y-values. In this equation, for any given value of x, there will be a corresponding value of y (y = 1 - x). Therefore, the range of the equation is also all real numbers.

Whether an equation defines a function or not depends on whether each x-value corresponds to a unique y-value. For this equation, each x-value does correspond to a unique y-value, so it is indeed a function.

Learn more about Domain and Range here:

https://brainly.com/question/36903938

#SPJ2

what is the sum of 4.2x10^5 and 5.3x10^5

Answers

The answer is:  " 9.5 * 10⁵ " .
__________________________________________________

4.2 * 10⁵  + 5.3 * 10⁵  = (4.2 + 5.3) * 10⁵ = 9.5 * 10⁵ .
__________________________________________________

Given A = {18, 6, -3, -12} Determine all elements of set A that are in the solution of the inequality 2/3x + 3 < -2x -7

Answers

Plug in each value in the set into x, and evaluate both sides.
The values of x that make the inequality true are the answer.

Start with 18.
2/3x + 3 < -2x -7
2/3(18) + 3 < -2(18) - 7
12 + 3 < -36 - 7
15 < -43 is false, so 18 does not work.

Now do 6.
2/3x + 3 < -2x -7
2/3(6) + 3 < -2(6) - 7
4 + 3 < -12 - 7
7 < -19 is false, so 6 does not work.

Now do -3.
2/3x + 3 < -2x -7
2/3(-3) + 3 < -2(-3) - 7
-2 + 3 < 6 - 7
1 < -1 is false, so -3 does not work.

Now do -12.
2/3x + 3 < -2x -7
2/3(-12) + 3 < -2(-12) - 7
-8 + 3 < 24 - 7
-5 < 17 is true, so -12 does not work.


Which expression is equal to
5(2x2 – 1) + 3(7x2 + 1)?

Answers

i think is      31x2  - 2 im not shure but tell me if is true

Answer:

31x^2 - 2

Step-by-step explanation:

how can you divide larger dividends?

Answers

Remember to place a zero in the quotient when the divisor is larger than the dividend.

Place the decimal point in your quotient.

Check your answer: Multiply the divisor by the quotient to see if you get the dividend.

estimate the number of hot dogs sold by rounding each number in the table to the nearest thousand and finding the sum

Answers

You need to tell us what number of hot dogs there are, I can help you solve this!

What is 5 radical 24, times, 2 radical 28? Please explain using steps!! :)

Answers

5√24 = 5*√4*√6 = 10√6 

2√28 = 2*√4*√7 = 4√7 

10√6*4√7 =
 
40√42<---- that is our final answer ^-^

Pierre has a 15gram bag of cashews. When he examines the nuts, he finds that 4/7 of this amount is whole nuts and 1/3 is only half nuts. The remaining nuts are small pieces. How many grams consist of small pieces?
Please show work.
a. 2.8g b. 2.9g c. 13.5g d. 13.6g

Answers

im not sure but i think 3/7

At one college, GPA's are normally distributed with a mean of 2.7 and a standard deviation of 0.5. What percentage of students at the college have a GPA between 2.2 and 3.2?

Answers

Final answer:

About 68.27% of students at the college have a GPA between 2.2 and 3.2 because these values correspond to z-scores of -1 and +1, respectively, in a normal distribution.

Explanation:

To find the percentage of students at the college who have a GPA between 2.2 and 3.2, we will use the properties of the normal distribution. The mean GPA is 2.7 and the standard deviation is 0.5.

First, we calculate the z-scores for the GPAs of 2.2 and 3.2:

z-score for 2.2 = (2.2 - 2.7) / 0.5 = -1

z-score for 3.2 = (3.2 - 2.7) / 0.5 = +1

The z-score represents the number of standard deviations a data point is from the mean. In a standard normal distribution, the percentage of data between z-scores of -1 and +1 is approximately 68.27%.

Therefore, about 68.27% of the students at the college have a GPA between 2.2 and 3.2.

Write 6.85• 10 to the 8th power in standard form

Answers

685,000,000 would be the right number. Hope this helps! 
6.85 x 10^8 = 685,000,000

hope that helps
--------------------------

4(4x+3)=19x+9-3x+3 what are the steps

Answers

Ok so:

4(4x+3) = 19x + 9 - 3x +3
parenthesis first:
4 x 4x = 16x    then    4 x 3 = 12

16x + 12 = 19x + 9 - 3x + 3
combine :) :
19x - 3x = 16x   then    9 + 3 = 12

16x + 12 = 16x +12
       -12             -12
16x = 16x
They are the same equations lol they equal 0. 

The steps of the expression are given below.

What is an expression?

Mathematical expression is defined as the collection of the numbers variables and functions by using operations like addition, subtraction, multiplication, and division.

Given that;

The expression is,

⇒ 4 (4x + 3) = 19x + 9 - 3x + 3

Now,

Solve the expression as;

The expression is,

⇒ 4 (4x + 3) = 19x + 9 - 3x + 3

⇒ 16x + 12 = 19x + 9 - 3x + 3

⇒ 16x + 12 = 16x + 12

⇒ 16x - 16x = 12 - 12

⇒ 0 = 0

Thus, The steps of the expression are given below.

Learn more about the mathematical expression visit:

brainly.com/question/1859113

#SPJ2

Use the substitution method to solve the given system of equations. -6y+18=12x and y=3-2x

Answers

We are given that y = 3 - 2x

We will substitute with this value in the second equation as follows:
-6y + 18 = 12x
-6 (3-2x) + 18 = 12x
-18 + 12x + 18 = 12x
This will give us zero = zero

A 0=0 solution means that the system has infinitely many solutions.

Therefore, the answer is (c)

32 gal/min = what qt/h

Answers

32g/m = 32*60 = 1920 gallons per hour

1 gallon = 4 quarts

1920 *4 = 7680 quarts per hour

Answer: 7529.4 qt/hr

Step-by-step explanation:

The conversion used from gal to qt is:

1 gal = 4 qt

32 gal= [tex]\frac{4}{1}\times 32=128[/tex]

The conversion used from min to hr is:

60 min = 1 hr

1 min =[tex]\frac{1}{60}\times 1=0.017hr[/tex]

We are asked: 32 gal/min = ? qt/hr

[tex]32gal/min=\frac{128}{0.017}qt/hr=7529.4qt/hr[/tex]

Therefore, the conversion 32 gal/min = 7529.4 qt/hr

Jay is cutting a roll of biscuit dough into slices that are 3/8 inch thick. If the roll is 10 1/2 inches long, how many slices can he cut?

Answers

He can cut 28 slices. Hope this helps

He can cut 28 slices I have the same homework so I hope this helps much love and your welcome !!

In a parking lot there are 630 cars 270 convertibles in 360 minivan what is the ratio of cars to convertibles

Answers

630:360 or 630/360 or 630 to 360
270:360

or 

3:4

for every 3 convertibles there are 4 minivans

hope this helps

3/4x - 5y = 7
X = -4y + 12

solve by substitution ! show work pls !!

Answers

When using substitution, we are imputing an equation in place of a variable to eliminate one of the variables in the equation so that we can solve for the remaining variable.

For this example, we will be plugging in (-4y+12) wherever "x" is in the other equation.

3/4 x -5y = 7
3/4(-4y+12) -5y =7
((3/4)(-4y))+((3/4)12)-5y=7
-3y+9-5y=7
-8y= -2
y=(1/4)


Now find "x" by plugging in the y-value.
x=(-4*(1/4))+12
x= -1 +12
x=11

any questions? feel free to comment below!

A jar contains 20 yellow marbles, 55 green marbles, and 25 purple marbles. You pick one marble from the jar at random. What is the theoretical probability of picking a green marble

Answers

So, if the jar has 20 yellow marbles, 55 green marbles, and 25 purple marbles in total it has 100 marbles. (check:20+55+25=100m). Sense there are 55 green marbles out of 100, your theoretical probability will be 550/100(fraction:55 over 100). Simplified its 11/20. 

Answer:

The theoretical probability of picking a green marble is 0.55.   Step-by-step explanation:

Given : A jar contains 20 yellow marbles, 55 green marbles, and 25 purple marbles. You pick one marble from the jar at random.

To find : What is the theoretical probability of picking a green marble?

Solution :

Theoretical probability is defined as the number of favorable outcome divided by total number of outcome.

Yellow Marble = 20

Green Marble = 55

Purple Marble = 25

Total Number of marble = 20 + 55 + 25 = 100

Let G be the event of getting green marble.

So, Favorable outcome = 55

Theoretical probability of picking a green marble is

[tex]P(G)=\frac{55}{100}[/tex]

[tex]P(G)=\frac{11}{20}[/tex]

[tex]P(G)=0.55[/tex]

Therefore, The theoretical probability of picking a green marble is 0.55.

A generator runs for 2 1/2 hand uses 4 3/8 gals of fuel. How many gallons of fuel did the generator use each hour?

Answers

divide gallons used by time

4 3/8 = 35/8

2 1/2 = 5/2

35/8 / 5/2 = 35/8 * 2/5 = 70/40 = 7/4 (simplest form) =  1 3/4 gallons per hour

$14 socks; 15% discount

Answers

If you know the DP rule then if you see a percent move it two spaces to the right to make it a decimal so 15% is actually .15 as a decimal multiply .15 and 14 and that should give you 2.1. Because it is a discount you subtract 2.1 form 14. 14-2.1 is 11.9

Please help!

Which statement best explains the value of 16 − (−3)? (1 point)
The additive inverse of −3 is −3, so 16 − (−3) = 19.
The additive inverse of −3 is −3, so 16 − (−3) = 13.
The additive inverse of −3 is +3, so 16 − (−3) = 19.
The additive inverse of −3 is +3, so 16 − (−3) = 13.

Answers

The answer is the bottom choice. I just had this question last week. I hope this helps!

The answer is the bottom choice. i hope this help you(-;

There are two sizes of trucks available: larger truck with a 2.5-ton payload, and smaller trucks with 1.5-ton payload. To unload a freight train 21 larger trucks are needed . How many smaller trucks would be needed for the same job?

Answers

You can find the answer to this question by multiplying 21 by 2.5 to find the total weight ton which would be 52.5, then you would divide 52.5 by 1.5 to find the number of small trucks needed to equal 52.5 ton which would be 35 smaller trucks. So your answer should be 35 smaller trucks are needed to do the same job.

Answer:

It’s 35 because my math teacher told me

Step-by-step explanation:

what is 40÷4-(5-3)??

Answers

Answer:

8

Step-by-step explanation:

40/4=10-2=8

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