Question

A power company calculates a person’s monthly bill from the number of kilowatt -hours ( kwh) , x, used . the function b(x)= determines the bill. how much is the bill for a person who uses800 kwh in a month ? a. $110 b.$60. $90 d.$80

If it is $0.20/kwh, then we would have: b(x) =$0.20x
b(800) = $0.20*(800) b(800) =$160