Can someone plz help on how to fix this or what’s the problem with my school computer!???

Toyland is having a sale. all items are 20% off. how much will you save on an item that usually sells for 95$ explain your

Aswimming pool has an input pump for filling the pool and an output pump for emptying the pool. the input pump can fill the pool in 3 hours, and the output pump can drain the pool in 5 hours. as you go to bed, the pool is full, but a neighbor’s kid turns on the output pump. at midnight, you awake to find the pool half empty. immediately, you turn on the input pump, but you are sleepy and forget to turn off the output pump. at what time will the pool become full?

What is the solution to the equation 9^(x+1) =27