Please help me on my assignment I am begging you

Which is the graph of the function y=2(4)^x

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8

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?