SOLUTION: What is the answer for 40, 50, & a?

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Question 304220: What is the answer for 40, 50, & a?
Answer by JBarnum(2146) About Me  (Show Source):
You can put this solution on YOUR website!
50 is higher then 40 so 50=c and 40=b
a%5E2%2Bb%5E2=c%5E2
a%5E2%2B40%5E2=50%5E2
a%5E2%2B1600=2500
a%5E2=2500-1600
a%5E2=900
sqrt%28a%5E2%29=sqrt%28900%29
a=30