Hey there! I'm happy to help!
To find the hypotenuse of a right triangle given two legs, you use the Pythagorean Theorem.
a²+b²=c², where a and b are the legs and c is the hypotenuse.
Let's plug our values into the equation and solve for c (our hypotenuse).
75²+100²=c²
Square the numbers
5625+10000=c²
Add them
c²=25625
Square root both sides
c=125
Have a wonderful day and keep on learning! :D