What's the radius and diameter of a circle with a circumference of 20π pi circumference=2πr
diameter=2r

Astuntman jumping off a 20-m-high building is modeled by the equation h=20-5t^2, where t is the same in seconds. a high-speed camera is ready to film him between 15m and 10m above the ground. for which interval of time should the camera film him?

X2 + y 2 = 36 x + y = 6 solve the system of equations.

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?