At a birthday party, 5 boys and 3 girls are seated in a row. How many different arrangements are possible if: the leftmost and rightmost end seats are occupied by boys, and no girls are seated next to each other?
(no explanation needed)

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?