900=(1/2)*b*10*15
1800=150b
b=12
I hope you can figure out FC with this info.
The app photo math is really awesome,
I Hope this Helps!
A. The temperature goes higher-lower-steady/same-lower-same.
B. I do not understand the question
1/2 * 1/4 = 1/8
3/8 * 2/3 = 1/4 same for back left fin
2/5 *1/2 = 1/5
2/3 *1/2 = 1/3
1/4 + 3/4 = 8/8
2/3 +1/6 = 5/6
4/5 +1/5 = 4/4
1/4 +1/5 = 9/20
front/back right fin = 3/8
x+ 1 2/3..... = 4/5