Answer:
20
Step-by-step explanation:
Use the equation 
Where b2 is a, b1 is b and h is h
Step-by-step explanation:
best of luck dear.........
X = x
to solve, subtract both sides by x:
0 = 0
x is always equals to x so infinite solutions
Answer:
it would be 20 I'm not 100 percent tho
Answer:
B. Recursive
Step-by-step explanation:
I calculated it logically