To pass a test in a water safety course, a student must get 80% of the questions correct. There are 90 questions on the test. How many questions must a student answer correctly to pass the ? i need help im on a time limit

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?

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

In dire need~! describe how to use area models to find the quotient 2/3 divided by 1/5. check your work by also finding the quotient 2/3 divided by 1/5 using numerical operations only.