x is the hypotenuse (as it is opposite the right angle). Follow the a² + b² = c² formula.
let a = 10
let b = 24
let c = x
Plug into the equation:
(10)² + (24)² = x²
Simplify
10² = 100
24² = 576
100 + 576 = x²
x² = 676
Isolate the x. Root both sides
√x² = √676
x = √676
x = 26
x = 26 is your answer
hope this helps