Use the formula C = 2nr and = 3.14 to find the circumference of a circle with a radius of 5 meters

Someone answer asap for ! a ball is rolled down a ramp. the height, f(x), in meters, of the ball x seconds after it is released is modeled by the function f(x) = x²- 10x + 25 for all values of x from 0 to 5. which statement about the ball is true? a. the maximum height of the ball is 5 meters b. the height of the ball increases from 0 to 5 meters above the ground. c. the ball has traveled 5 meters when it reaches the bottom of the ramp. d. the ball has been traveling for 5 seconds when it reaches the bottom of the ramp

4+(2+x) can you me solve this problem

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x