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use the pythagorean theorem :
x^2 = 24^2 - 12^2
solve for x

Do you have a calculator?

Yea

if not, just type it in google. square root of 432. you know that it is between 20 and 21 "

since 432 is between 400 and 441

I got 20.78 would that be right?

correct!

Thanks! Can you help me with 1 other problem?

I'll try!

I'm gonna post it in a sec