What is the value of x?

What is the exact area of a circle with a diameter of 50 centimeters? a.87.9 square centimeters b.379.9 square centimeters c.1962.5 square centimeters d.4923.5 square centimeters

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.