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by using the answer to c.)

      20 Solve these exponents.

      (a)

      (b)

      (c)

(d)

Practice Questions Answers and Explanations

      1

      (a)

      (b)

      (c)

      (d)

      2

      (a)

      (b)

      (c)

      (d)

      3

      (a)

      (b)

      (c)

      (d)

      4

      (a) 110. Rewrite as its inverse: . Therefore,

      (b) 15. Rewrite as its inverse: So, .

      (c) 87. Rewrite using the commutative property: . Now rewrite this equation as its inverse: . Therefore, .

      (d) 203. Rewrite by switching around the two numbers next to the equal sign: . So, .

      (e) 81. Rewrite using the commutative property: . Now rewrite this equation as its inverse: . So, .

      (f) 20. Rewrite by switching around the two numbers next to the equals sign: . So, .

      5 58. First, do the multiplication inside the parentheses:

      Now add: .

      6 123. First, do the subtraction inside the parentheses:

Now simply divide .

      7

      (a)

      (d)

      Yes, the placement of parentheses changes the result.

      8

      (a)

      (b)

      No, because of the associative property of addition, the placement of parentheses doesn’t change the result.

      9

      (a)

      (b)

      No, because of the associative property of multiplication, the placement of parentheses doesn’t change the result.

      10 937,690. The problem is easiest to solve by placing parentheses around :

      11

      12

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