Pythagorean Theorem and identify right triangles.

In triangle PQR, the sides PQ, QR and PR measure 15 in, 20 in and 25 in. respectively. Prove that PQR is a right triangle.

Let hh represent the number of hummingbirds and ss represent the number of sunbirds that must pollinate the colony so it can survive until next year. 6h+4s > 746h+4s> 74 this year, 88 hummingbirds pollinated the colony. what is the least number of sunbirds that must pollinate the colony to ensure that it will survive until next year?