Answer:
a. 126
b. 15120
Step-by-step explanation:
5 chose 9 = 9 * 8 * 7 * 6 * 5/1/2/3/4/5 = 126
if order matters...
9*8*7*6*5 = 15120
12×8/2=48
10×10=100
2(48)+3(100)
96+300= 396ft²
20
If you work this out you get 1:
5/100*20
5 divided by 100 is 0.05 then 0.05 times 20 is 1