You click on the button that says "Y=" then you type in the equations into y=1 , y=2 and so forth. click graph and the lines will appear. use the up, down, left, and right buttons to move the cursor and find the exact point.
Answer:
122
Step-by-step explanation:
32+32+29+29=122
The tree is 7.5ft because it's shadow is half it's height.