Find the value of k so that the differential equation is exact, and find the general solution

What are the domain and range of the function? f(x) = -4 (sqrt)x

Nikolas calculated the volume of the prism. his work is shown below.

Miss henderson wants to build a fence around a rectangular garden in her backyard in the scale drawing the perimeter of the garden is 14 in of the actual length of a b is 20 ft how many feet of fencing what you need