Please help me simplify (1/2) ^4

Write a corresponding real world problem to represent 2x - 125=400

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.

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?