What is the value of 52 43 X

Solve the system of equations. y= 2x y= x^2 - 15

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm

Express -5 2/5 as an improper fraction.