Specialty t-shirts are being sold online for $15 each, plus a one-time handling fee of $2.25. Which equation below represents the total cost, y,
of buying x t-shirts?
A. y = 15x + 2.25
B. y = 17.25x
C. y 15x - 2.25
D. y = 2.25x + 15
Please answer!!!

A

Step-by-step explanation:

If x is the number of shirts you multiy by 15. 2.25 is the additional cost

d. 24+-0.114

step-by-step explanation:

the question requires us to calculate the approximate 95% confidence interval for the mean number of ounces of ketchup per bottle in the sample given the following statistics;

sample mean = 24

standard deviation, σ = 0.4

sample size , n = 49

the confidence interval for a population mean is calculated using the formula;

sample mean ± z-score*(σ/sqrt(n))

the z-score associated with a 95% confidence interval, from the standard normal tables, is;

1.96

substituting these values into the formula;

24 ± 1.96*(0.4/7)

= 24 ± 0.112

from the alternatives given, choice d is closest to the above expression;

answer: 7 x 2/5 = 2.8 hours, is your answer. your welcome! : 3

step-by-step explanation: first work out how long it took to hose 1/7 of the lawn which is 2/5 hours. times that by 7 to get the whole lawn.

sorry i don't know the other answer. i didn't learn what a proportional relationship is.