{Picture attached} I WILL MARK BRAINLIEST TO THE ANSWER WITH THE GOOD EXPLANATION :)

Are carpet coast $15 per square metre. the total delivery charge is $21 peter buys n squared metres of carpet what is the expression which represents the total cost in $

Tamera puts 15/4 gallons of gasoline in her car. which mixed number represents the gallons of gasoline? a) 2 3/4 gallons b) 3 1/4 gallons c) 3 3/4 gallons d) 4 1/2 gallons answer it's worth a lot of points!

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