Which expression equivalent to 5^4•(5^2)^3 PLEASE IM DUMB

An astronaut drops a rock into a crater on the moon. the distance, d(t), in meters, the rock travels after t seconds can be modeled by the function d(t)0.82. what is the average speed, in meters per second, of the rock between 5 and 10 seconds after it was dropped?

What two consecutive odd integers have a sum of -28

1. what are the missing reasons in the proof 2. it's in the second picture and 3