How do you use compensation to find 41 x 4?

I'm being volume of cylinder with 13 in. radius and 30 in height answer choices in pic

Leo is going to use a random number generator 4 0 0 400 times. each time he uses it, he will get a 1 , 2 , 3 , 4 , 1,2,3,4, or 5 5. what is the best prediction for the number of times that leo will get an odd number?

How many $20 bills do you need to have to make $280