Jada walks up to a tank of water that can hold up to 15 gallons. When it is active, a drain empties from the tank at a constant rate. When Jada first sees the tank, it contains 12 gallons of water. Three minutes later, the tank contains 6 gallons of water. At what rate is the amount of water in the tank changing. Use a signed number. (positive or negative number)

gallons per minute

How many more minutes will it take for the tank to drain completely?

minutes

How many minutes before Jada arrived was the water tank completely full?

minutes

Valentino starts with a population of 1,500 amoebas that increases 35% in size every hour for a number of hours, h. the expression 1,500(1+0.35)h finds the number of amoebas after h hours. which statement about this expression is true? a. it is the initial population raised to the growth factor after h hours. b. it is the sum of the initial population and the percent increase. c. it is the sum of the initial population and the growth factor after h hours. d. it is the product of the initial population and the growth factor after h hours.

The head librarian at the library of congress has asked her assistant for an interval estimate of the mean number of books checked out each day. the assistant provides the following interval estimate: from 740 to 920 books per day. what is an efficient, unbiased point estimate of the number of books checked out each day at the library of congress?

I’m on question 7 it says a covered water tank is in the shape of a cylinder the tank has a 28 inch diameter and a height of 66 inches to the nearest square inch what is the surface area of the water tank