A 20-inch candle burns down in 10 hours. At what rate does the candle burn, in inches per hour?

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

Awater truck is filling a swimming pool. the equation that represents this relationship is y=19.75x where y is the number of gallons of water in the pool and x is the number of minutes the truck has been filling the pool.