I just need to know how to calculate

The answer is -a^2 I just have no idea how you get to that answer

Amarathon runner jogging at a constant speed for 45 minutes is it proportional to time or not

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.

Asailor is looking at a kite. if he is looking at the kite at an angle of elevation of 36and the distance from the boat to the point where the kite is directly overhead is 40 feet, how high is the kite?