What is the range of y=-x^2+2x+8

Classify the following triangle check all that apply

The larger of two number is 4 less than twice the smaller number. the sum is 41. find the numbers

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?