Represent y=-3x+9 in function notation

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?

Solve the following inequalities and show the solution on a number line. 2x+3< 3(4x+5)

Tom travels between the two mile markers shown and then finds his average speed in miles per hour. select the three equations that represent this situation.