Simplify: (x + 7)(x-4)
A. 2r +3
B. 12-28
C. x2-3x - 28
D. x2 + 3x - 28

If the cost to mail a package is an initial $5 and $0.28 for every pound the total cost to mail a package was $11.27, how much did the package weigh?

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

What is the total area of the figure?