The formula for finding the perimeter of a rectangle is P= 21+2w. Which equation solved for w in terms of P and l? A. w=P/21
B. w= p+21/2
C. w= p-21/2
D. w= 2(P-21)

I think the answer is B

Since the triangle is a right triangle, you can use the Pythagorean Theorem to find the length of the hypotenuse.
The Pythagorean Theorem: a² + b² = c², where c is the hypotenuse of the triangle.

Plug in the leg lengths and solve.

    a² + b² = c²
    3² + 4² = c²
    9 + 16 = c²
          25 = c²
            5 = c

The length of the hypotenuse is 5 ft.