I’m not sure what they mean by right triangle? Can u help?

A right triangle with a 90 degree angle. Also, for the question, use the Pythagoras theorem. a^2 + b^2 = c^2. Use the two smaller sides for a^2 + b^2 and the larger number for c^2. If they are equal on both sides, then it is a right triangle. For example on the first problem, 10^2 + 15^2 does not equal 20^2. Therefore, the answer would be no.

I believe it is 37 humans and 37 horses

Step-by-step explanation:

Divide the heads by 2, it will equal 37 heads so 37 horse heads and 37 human heads. If they are at a horse race they need 1 human to ride 1 horse so therefore that is why i divides it by 2. (hope thats right)