Question

alguem me ajuda pfv.... ​

Answer 1

Resposta:

$a = m + n \\ a = 15 + 5 \\ a = 20 \\ \\ b ^{2} = a \times n \\ b {}^{2} = 20 \times 5 \\ b ^{2} = 100 \\ b = \sqrt{100} \\ b = 10$