Answer:
a
Step-by-step explanation:
6^2+8^2=100
sqrt of 100 = 10
N/10 = 32,7
N = 32,7*10
N = 327
Mario's mistake is made when doing reciprocal.
7 / (2/3) =
I cannot divide by 2/3, but if I do reciprocal, I can multiply by 3/2. The seven comes first, so it should not be flipped.
Mario's mistake was when he flipped the 7 (or 7/1) to 1/7.