Suppose you have a $8-off coupon at a fabric store. You buy fabric that costs $7.50 per yard. Write an equation that models th
e total amount of money y you pay if you buy x yards of fabric. What is the graph of the equation?
2 answers:
Answer:
= 7.5x-8
Step-by-step explanation:
Total cost = cost per yard * yard of fabric - coupon
total cost = 7.5 x - 8
y = 7.5x-8
Answer:
Step-by-step explanation:
For the equation, the amount of money is , and the number of yards is
.
So, the problem says that the persona already have $8, which is constant, it wont' variate, that is, this is the independent term.
Then, it says the the fabric costs $7.50 per yard, and refer to yards, so this term would be
.
Therefore, the equation to model this problem would be:
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Answer
a. True
Step-by-step explanation:
Based on this survey we estimate that about of the college students smokes. And a
confidence interval is
. So we know that
our estimative for the smoking rate is in the confidence interval with
certainty. We also know the estimative for the smoking rate in the general population is
. So we can write the two possible hypothesis:
Smoking rate is equal to
.
Smoking rate is not equal to
.
We will reject the null hypothesis if the estimate doesn't fall into the confidence interval for the college students smoking rate.
Since this condition holds we reject the null hypothesis. So with certainty we say that the smoking rate for the general population is different than the smoking rate for the college students.