David painted for 2 hours and 40 minutes. david finished painting at 6: 25 pm. when did david start painting?

The quadratic function h(t)=-16.1t^2+150 choose the graph representation

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?