How tall do people in your immediate and extended family tend to be is that a statistical question

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

If 20% of a number is 35, what is 50% of that number?

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?