Which of the equation has a solution of 9.
a. w-12=21
b. r- 1 = 10
c. a + 3 = 12
d. m + 9 = 81

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Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

Scenario: susan wants to make 2 square flags to sell at a crafts fair. the fabric she wants to buy is 3 meters wide. she doesn't want any fabric left over. what's the least amount of fabric she should buy? question: which equation will susan solve her problem? note: let x represent the length of 1 side of the flag. options: 1) 2x^2 = 4x 2) 8 +2x = 2(4x) 3) 2 * 2 = 4 * 2 4) 4x^2 -2x = 0