Marco drew 24 pictures. he drew 1/6 of them in art class. how many pictures did marco draw in art class?

What is the smallest integer n such that n\sqrt{2} is greater than 20

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?

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?