Exercise 37.

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Exercise 38.

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First of all, this formula is used to find the permiter of a rectangle.
However, what we need to do in this exercise is to solve W (width).
  • First, we switch 2L to the left keeping in mind the every time we switch a variable its sign will change as well. So it should look like this:

P - 2L = 2W

  • Second, in order to isolate only W, we should divide evrything by 2.

P/2 - 2L/ 2 = 2W/2

  • Third, we simplify same terms and the answer should be:

P/2 - L = W or W= P/2 - L

Exercise 39.

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