Jessica has four more hockey cards than one third the number of cards that david owns if jessica has 12 hockey cards how many does david have

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?

Anyone know? will mark brainliest if you're correct!

Select all of the quadrants that the parabola whose equation is y=√x-4 (principal square root) occupies. i ii iii iv