What number must you add to complete the square?
x^2 + 2x = -1

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)

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.

Donald has x twenty-dollar bills and 11 ten-dollar bill. how much money does donald have? write your answer as an expression.