Which expression is equivalent to (2r² + r - 1) - (3r² + 4r - 5) ?
A.)  -r² - 3r + 4
B.)  -r² + 5r - 6
C.)  5r² - 3r + 4
D.)  5r² + 5r - 6

The gravitational potential energy of an object is given by the formula P = mgh.
Which equation is correctly solved for the height, h?
A.)  h = P + mg
B.)  h = P - mg
C.)       P
     h = ----
           mg

​D.)  h = Pmg

The graph of a quadratic function f(x) has a minimum at (-2,-3) and passes through the point (2,13).  The function g(x) is represented by the equation g(x) = -(x + 2)(x - 3).

How much greater is the y-intercept of g(x) than f(x)?