8x100=8x10 to the second power?

Acontractor needs 54 square feet of brick to construct a rectangular walkway. the length of the walkway is 15 feet more than the width. write an equation that could be used to determine the dimensions of the walkway. solve this equation to find the length and width, in feet, of the walkway.

Find dy/dx using implicit differentiation ln(20+e^xy)=y

Select a graph that have an equation with a < 0