Amy drove to a friend's house at a rate of 45 mph. She returned by the same route at a rate of 50 mph. The driving time for the round trip was 4 hours. What is the total distance Amy
traveled?

The path traveled by a bottlenose dolphin as it jumps out of water is modeled by the equation y=-0.4+3x, where t is the height above water and x is the horizontal distance in feet. if a beam of light is shone upward at an angle modeled by the equation x+y=10, at what height from the waters surface will the beam of light hit the dolphin