Find the equation of a parabola with a focus at (-2,-3) and a directrix at y=-5

a.) y=1/4(x+2)^2-8
b.) y=1/4(x-2)^2-4
c.) y=1/16(x+2)^2-4
d.) y=1/4(x+2)^2-4

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?

The average number of vehicles waiting in line to enter a parking lot can be modeled by the function f left parenthesis x right x squared over 2 left parenthesis 1 minus x right parenthesis endfraction , where x is a number between 0 and 1 known as the traffic intensity. find the rate of change of the number of vehicles waiting with respect to the traffic intensity for the intensities (a) xequals0.3 and (b) xequals0.6.

Use the data on the dot plot to answer the question. how many people read for more than three hours last week? i'm on a unit test review