Answer: x=24
Explanation:
Ok, this one is a bit tricky, you just have to keep in mind that directions specifically state that this is a rectangle.
A rectangle's opposite sides will always be the same, so the side opposite to 7 (the bottom of the rectangle) is also 7.
Now we should only be concerned with the triangle that includes the side-length that is x. So now we can use the Pythagorean theorem:
(leg length)^2+(other leg length)^2=(hypotenuse)^2
So if we plug in the values we have:
7^2+x^2=25^2
Solve for x:
49+x^2=625
x^2=625-49
x^2=576
x=
(square root is the inverse of square)
x=24
Hope this helps :)