Help me please
Which of the following relations is a function?

A.

(3, 4), (-4, 6), (3, 3), (-8, 2)

B.

(3, 0), (-4, 3), (8, 1), (-4, 5)

C.

(8, 1), (-4, 4), (3, 1), (8, 2)

D.

(3, 4), (-4, 2), (8, 1), (-8, 2)

Mary works for a company that ships packages and must measure the size of each box that needs to be shipped. mary measures a box and finds the length is 7 inches, the width is 14 inches, and the height is 15 inches. what is the volume of the box? [type your answer as a number.]

The marriott family bought a new apartment three years ago for $65,000. the apartment is now worth $86,515. assuming a steady rate of growth, what was the yearly rate of appreciation? what is the percent of the yearly rate of appreciation?

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )