What is the measure of the internal angle H' of the image in degrees

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?

Find the area of a parallelogram with base 15 yards and height 21 2/3

East black horse $0.25 total budget is $555 it'll cost $115 for other supplies about how many flyers do you think we can buy