Which of the following relations is a function? a. (-8, 1), (0, -5), (2, 5), (5, 1) b. (-8, 4), (0, 6), (-8, 3), (5, 2) c. (2, 1), (0, 4), (-8, 1), (2, -5) d. (-8, 1), (0, 4), (2, -5), (0, 6)

After t seconds, a ball tossed in the air from the ground level reaches a height of h feet given by the equation h = 144t-16t^2. after how many seconds will the ball hit the ground before rebounding?

Suppose that a households monthly water bill (in dollars) is a linear function of the amount of water the household uses (in hundreds of cubic feet, hcf). when graphed, the function gives a line with slope of 1.65. if the monthly cost for 13 hcf is $46.10 what is the monthly cost for 19 hcf?

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years