Answer:
4√7
Step-by-step explanation:
hyp1(9)/alt(x)=hyp2(7)/alt(x)
By cross multiplication, x^2 = 63
thus, alt = √63
Then, with Pythagorean theorem, (√63) ^ 2 + 7 ^ 2 = z ^ 2
Thus, 63 + 49 = z ^ 2
Thus, 112 = z ^ 2
Thus, z = √112
Thus, z = 4 √7
