As seen in the diagram below, Camila is building a walkway with a width of xx feet to go around a swimming pool that measures 13 feet by 10 feet. If the total area of the pool and the walkway will be 304 square feet, how wide should the walkway be?



Answer :

Answer:

  3 ft

Step-by-step explanation:

You want to know the width of a uniform walkway around a 13 ft by 10 ft pool that brings the total area to 304 square feet.

Area

If w is the width of the walkway, the total area of pool and walkway is ...

  A = LW

  A = (13 +2w)(10 +2w) = 130 +46w +4w² = 304

Rearranging, and dividing by 4, we have ...

  w² +11.5w = 43.5

  (w +5.75)² = 76.5625 . . . . . . . . complete the square

  w = -5.75 ±8.75 = {-14.5, 3.0} . . . . . square root, subtract 5.75

The width of the walkway should be 3 feet.