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ValentinkaMS [17]
3 years ago
9

Denise attends a book sale at her local Library each year. The library sells books it no longer wants at a discount to the publi

c. She pays a fixed admission cost, plus $3 for each book she decides to purchase.
Write a formula that describes how much Denise spends at the book sale.

a = cost of admission
n = number of books she buys
t = total cost of attending the book sale
Mathematics
2 answers:
Sholpan [36]3 years ago
5 0
Here you go:
3 • n + a=t
Lelu [443]3 years ago
3 0

Answer:

t = a +( n×3 )

Step-by-step explanation:

Denise attends a book sale at her local Library each year.

She pays a fixed admission fee and $3.00 for each book she decides to purchase.

To determine Denise spends at a book sale the equation will be

t = a +( n×3 )

Where t = Total cost of attending the book sale

           n = number of books she buys

           a = cost of admission

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tamaranim1 [39]
Let say the number is 0.5
Then, sum of this number will be 0.5+0.5=1
Now two is twice of 1.
Hence, it proved to be correct.
And difference between 5 and 1 is 4 which is less than 12. It also match the question condition.

Answer: The number is 1.
3 0
3 years ago
The line segment formed by joining points A (-1,y) B (0,0), and the line segment joined by forming points C (6,3) D (8,9) share
Airida [17]

Answer:

<h3>-3</h3>

Step-by-step explanation:

For two parallel lines. their slope are equal

Find the slope of each of the lines

For line A;

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For line B;

mB = 9 - 3/8 - 6

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since their slope are equal hence mA = mB

-y/1 = 3

-y = 3

y = -3

Hence the value of y is -3

8 0
3 years ago
the brain volumes ​(​) of 50 brains vary from a low of to a high of . use the range rule of thumb to estimate the standard devia
Sloan [31]

The estimated standard deviation from the range rule is 145.5 cm3.As it is 29.8 cm3 smaller than the exact standard deviation, we consider that the estimation is not accurate enough.

Generally, brain volumes which are smaller than 921.1 cm3 can be considered significantly low and bigger than 1417.5 cm3 can be considered significantly high. Hence, brain volume of 1457.5 cm3 is bigger than the expected maximum, so it can be considered significantly high.

The calculation goes like this,

According to the range rule, the standard deviation and range, or the distance between the maximum and smallest value, are roughly inversely proportional:

s=R/4

If we have a sample of 50 brains volumes, and they range from 910 cm3 to 1492 cm3, we can estimate the standard deviation as:

s=max-min/4

s=1492-910/4=582/4=145.5

The exact standard deviation is 175.3 cm3.The difference is 175.3-145.5=29.8 cm3, so the estimation is not accurate enough.

The range rule of thumb states that we should anticipate a maximum value that is approximately two standard deviations above the mean and a lowest value that is approximately two standard deviations below the mean. The expected ranges are as follows given our mean volume of 1169.3 cm3 and standard deviation of 124.1 cm3:

Min= M-2s=1169.3-2*124.1=921.1

Max=M+2s=1169.3+2*124.1=1417.5

The brain capacity of 1457.5 cm3 can be regarded as significantly high because it is higher than the predicted maximum.

To know about standard deviation click here :

brainly.com/question/23907081

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5 0
1 year ago
notebooks cost 1.20 dollars each.This weekend they will be on sale for 0.80 dollars.What percentage is the sale
Fiesta28 [93]
1.20 divided by 0.80

4 0
3 years ago
Read 2 more answers
HELP WILL GIVE BRANLIEST!
Natali5045456 [20]

Answer:

Since it is vertical angles, 4x - 12 = 88.

Answer is 25

Step-by-step explanation:

88 + 12 = 100

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6 0
3 years ago
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