8times the sum of half a number and 12 is 30

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?

Which graph represents the equation y =4x

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.