Can someone check my answer to see if it's correct.

The answer I got is 111.1 ft

An episode of a television show is 60 minutes long when it originally airs with commercials. on a dvd without commercials, the episode is only 417 minutes long. how many1-minute commercials did the episode include when it originally aired? write and solve an equation to justify your answer.

The ratio of the height of two similar cylinders is 4 to 3 what is the ratio of their volumes

Let f(x) = 1/x^2 (a) use the definition of the derivatve to find f'(x). (b) find the equation of the tangent line at x=2