It takes a small pump 30 hours to empty a swimmingpool, whereas a large pump can empty the same pool in 50 hours. how long it will take to empty the pool if both pumps are open?

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)

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25

Can someone me with this graph problem by the way i need to know the answers by today since this assignment is due ! !