Which number should each side of the equation 4/5x=8 be multiplied by to produce the equivalent equation of x = 10?

(a.)−4/5

(b.)1/5

(c.)5/4

(d.)5

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?