Which author wrote the oldest textbook about the Roman Empire? A. Liza Maxwell
B. Matthew Jamison
C. Deborah Johnstone
D. Josh Barriston

I think A

Explanation:

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the answer will be b

the answer would be the third option, "no, ariel should have added 9^2 and 12^2 and compared that to 15^2."

this is found through the pythagorean theorem, which is a^2 + b^2 = c^2.

this is the correct way of solving the problem:

9^2 + 12^2 = 15^2

81 + 144 = 225

225 = 225