An elevator descends into a mine shaft at the rate of 10 m/min. If the descent starts from 25 m above the ground level, how long will it take to reach -475 m. *

Prove the divisibility of the following numbers: 25^9 + 5^7 is divisible by 30.also, read as (25 to the power of 9) + (5 to the power of 7) is divisible by 30. blank x 30what is the blank? ( it should be expressed in exponent form)