What is the sum of (2x - 5y) and (x + y)?

When a rectangle is dilated, how do the perimeter and area of the rectangle change?

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.