If I did everything correctly, It should be DEF.
Hope you get an A :d
Answer:
16 feet
Step-by-step explanation:
Set up a proportion where x is the height of the tree:
= 
Cross multiply and solve for x:
5x = 80
x = 16
So, the tree is 16 feet tall
The power of 4 means to move the decimal 4 places to the right. 6.3 x 10^4
63000