Does anyone know this math problem?

What is the exact volume of the cylinder (radius 13 in., height 30 in.)

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?

Logan wants to know how many skateboards have defective parts. he inspects 20,000 skateboards and keeps track of the number of defects per board. use his probability distribution table to find the expected value for defects on a skateboard.