Melanie had 67 dollars to spend on 7 books. after buying them she had 11 dollars. how much did each book cost?

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Is the square root of 4 plus the square root of 16 rational?

Amodel rocket is launched from a roof into a large field. the path of the rocket can be modeled by the equation y = -0.04x^2 + 8.6x + 4.8, where x is the horizontal distance, in meters, from the starting point on the roof and y is the height, in meters, of the rocket above the ground. how far horizontally from its starting point will the rocket land? a. 0.56 m b. 215.56 m c. 431.11 m d. 215.74 m