Explain how the triangle, the parallelogram, and the trapezoid formulas and shapes are related? How are they similar?

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?

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Carlos spent 1 1/4 hours doing his math homework he spent 1/4 of his time practicing his multiplication facts how many hours to carlos been practicing his multiplication facts