Help me please

A. 7/24 B. 24/25 C. 7/25 D. 24/7​

Suppose the radius of a circle is 16. what issuppose the radius of a circle is 16. what is its circumference its circumference

Two airplanes start at the same place and travel in opposite directions,one at 395 miles per hour and the other at 422 miles per hour. how many hours will it take for the planes to be 2451 miles apart?

36x2 + 49y2 = 1,764 the foci are located at: (-√13, 0) and (√13,0) (0, -√13) and (0,√13) (-1, 0) and (1, 0)edit: the answer is (- the square root of 13, 0) and (the square root of 13, 0)