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tatiyna
3 years ago
15

Your station charges $16.50 for a lubrication job. As a promotion you sell six coupons for lubrication jobs for $90. What percen

tage discount are you offering for customers who purchase the 6-coupon lube book?
Discount (to the nearest tenth) = ___
Mathematics
2 answers:
Lena [83]3 years ago
4 0
Multiply 6 by $16.50 to get the total amount = $99

now to get the percentage discount : 99-90 (which is the difference) / 99 (original price of what it should have been )

and then multiply by 100 to get the percentage discount

Assoli18 [71]3 years ago
4 0
Hmm
find cost of 6 regular ones
6 times 16.6=99

so
regular-discountedprice=discount
99-90=9

discount is 9
wait, but out of what
that is 6 jobs so
9/6=1.5 discount per job
to find the percent discount
do
discount/original times 100
1.5/16.5 times 100
0.09090909 tims 100
9.090909

so 9% discount
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3 years ago
A researcher collects data on the relationship between the amount of daily exercise an individual gets and the percent body fat
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Answer: approximately 24

Step-by-step explanation:

We need to plot a regression line.

So we fit a model using the regression of Y on X, that an equation that predict Y for a given X using:

(Y -mean(Y ))= a(X-meanX)...........1

Where the formular of a is given the attachment.

N= the of individuals = 5

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mean(X )= sum of all X /N

= 131/5 = 26.2

mean(Y) = sum of all Y/N

= 104/5 = 20.8

a = N(SXY) - (SX)(SY)/ NS(X²) -(SX)²......2

SXY = Sum of Product X and Y

SX= sum of all X

SY = Sum of all Y

S(X²)= sum of all X²

(SX) = square of sum of X

a = -0.478

Hence we substitute into 1

Y-20.8 = -0.478 (X-26.2)

Y -20.8 = -0.478X - 12.524

Y = -0.478X + 33.324 or

Y = 33.324 - 0.478X (model)

When X = 20

Y = 33.324 - 0.478 × 20

Y = 33.324 - 9.56

Y = 23. 764

Y =24(approximately)

Carefully meaning of formula used in attachment to the solution they are the same.

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