The correct is 40 hope I helped
Answer:

Step-by-step explanation:
The diagram of the problem is drawn and attached.
Given that:



Also

Answer:yes
Step-by-step explanation: the answer does represent a function because if you were to put points in the line wherever, and connect them by drawing a line vertically, it would not cross two points.
So the tree is 40 ft and then the shadow is 30 so then do 40 -30 = 10 ft difference so then for the second tree do 20 + 10 = 30 ft because the 10 ft difference so the answer is 30 ft tall
Answer: -2
(-5)(-1)x=(10)(-1)
5x = -10
x = -2