Given the picture attached, we can use the Pythagorean Theorem to solve it:
[tex]a^2+b^2=c^2[/tex]
Where a and b are the legs on the right triangle and c hypotenuse.
Hence:
[tex]\begin{gathered} b^2=c^2-a^2 \\ b=\sqrt{c^2-a^2} \\ b=\sqrt{25^2-7^2} \\ b=24 \end{gathered}[/tex]
ANSWER
b = 24
