bjbjj30 bjbjj30
  • 12-03-2021
  • Mathematics
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PLEASE HELPP i know the answer is 12 but how?

PLEASE HELPP i know the answer is 12 but how class=
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maccabee678 maccabee678
  • 12-03-2021
a^2+b^2=c^2

a^2+9^2=15^2

a^2+81=225
-81 -81

a^2= 144 (square root both sides)
a=12
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