Which picture shows the correct graph of |x|=6 ?

Abank gives 6.5% interest per year. what is the growth factor b in this situation?

How do i do this activity, is appreciated

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?