Two thirds of a numbers equal to 20 what is it

What is the approximate circumference of the circle shown below?

Amodel rocket is launched from a roof into a large field. the path of the rocket can be modeled by the equation y = -0.04x^2 + 8.6x + 4.8, where x is the horizontal distance, in meters, from the starting point on the roof and y is the height, in meters, of the rocket above the ground. how far horizontally from its starting point will the rocket land? a. 0.56 m b. 215.56 m c. 431.11 m d. 215.74 m

Matt had 5 library books. he checked out 1 additional book every week without retuening any books. whats the matching equation