Please help me with this question

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.

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

1.two more than the quotient of a number and 6 is equal to 7 use the c for the unknown number translate the sentence into an equation