The length of a rectangle is four times its width. if the area is 400 cm squared, find its perimeter

Solve with work both bert and ernie received an increase in their weekly salaries. bert's salary increased from $520 to $520. ernie's salary went from $580 to $645. find the percent of increase for each salary. what was the larger of the two percents ?

Just tell me how to set up the equation.

Which value would be a solution for x in the inequality 47-4x< 7