Answer:
PQ = 24
Step-by-step explanation:
This is a Pythagoras problem.
a = 7
b = ?
c = 25
25^2 = b^2 + 7^2
625 = b^2 + 49
625 - 49 = b^2
576 = b^2
sqrt(b^2) = sqrt(576)
b = 24
