Respuesta :

rockyblock

Answer:

18

Step-by-step explanation:

-- ^2 means squared/ to the power of 2

a^2 + b^2 = c^2

a^2 = c^2 - b^2

a^2 = 30^2 - 24^2

a^2 = 324

a = 18

the answerrrrr is 18

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