If x= eighth root of y and y= z^16 how is x proportionate to z ?

Aline passes through the point (2, -4) and has a slope of 0, what is the equation of the line? plz fast

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?

At the newest animated movie, for every 9 children, there are 4 adults. there are a total of 39 children and adults at the movie.