can someone please just set the equation for me to solve this problem . thanks
A solar collector is 2.5m long by 2.0m wide. It is held in place by a frame of uniform width around its outside edge. If the exposed collector area is 2.5m^2, what is the width of the frame, to the nearest tenth of a centimeter?
The area of the collector is (2.5-w)(2.0-w). Set that equal to 2.5, and solve for w.