The temperature on some planets in the galaxy can be as low as -340 degrees F. What is the equivalent Celsius temperature?

  1 yard

Step-by-step explanation:

If x is the width of the deck, then its area is the sum of the areas along each side and the areas of the squares in the four corners. The area along the sides is the product of x and the perimeter of the pool, which is 2(8+10) = 36 yards.

  40 = 36x +4x^2

  10 = 9x +x^2 . . . . . . divide by 4

  x^2 +9x -10 = 0 . . . . put in standard form

  (x -1)(x +10) = 0 . . . . . factor

The positive value of x that makes this true is x=1.

The width of the deck is 1 yard.