First assign the variable. let x represent the algebraic expression is?

What is the exact volume of the cylinder 1.5 m 2.5 m

Amir wants to proportionally increase the size of a photo to create a poster for his room. the size of the original photo is shown. complete the statement and then answer the question to represent ways that amir can increase the size of his photo.

Math i have no idea how to do a and b