Write a function that models each variation
X = 1/3, y = 1/5, and r = 3 when z = 1/2, and z varies directly with x and inversely with the product of r² and y.

Here we need to write a function that models each variation, so we know that:

We also know that z varies directly with x and inversely with the product of r² and y. In other words, we can write z as follows:

Therefore, the model is:

step-by-step explanation:

659

answer:   (s+1)(s+4)

step-by-step explanation:

factor s2+5s+4

s2+5s+4

=(s+1)(s+4)