Double digit subtraction with regrouping

How do i solve using pythagorean theorem?

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

Which term best describes the association between variables a and b? no association a negative linear association a positive linear association a nonlinear association a scatterplot with an x axis labeled, variable a from zero to ten in increments of two and the y axis labeled, variable b from zero to one hundred forty in increments of twenty with fifteen points in a positive trend.