Liam makes four small investments. He earns 2000, 4000, and 3000 dollars on three, but loses 1000 dollars on a fourth and is very upset. What were his
average earnings for the four investments?

Ahovercraft takes off from a platform. its height (in meters), xx seconds after takeoff, is modeled by: h(x)=-2x^2+20x+48h(x)=−2x 2 +20x+48 what is the maximum height that the hovercraft will reach?