Amath book at the victor valley college bookstore originally cost $84 to purchase if they sell it for $126 what is the markup rate

Solve for n? [tex]z = \frac{3}{4} mn[/tex]

The rectangle shown has a perimeter of 108 cm and the given area. its length is 6 more than five times its width. write and solve a system of equations to find the dimensions of the rectangle.

If x varies directly as y, and x = 7.5 when y = 10, find x when y = 4