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Let x be the number of months it will take for Jenny to grow her hair to 18 inches.

Since the hair grows at a rate of 1/2 inch per month, the equation that models this information is: (1/2)x + 12 = 18
Subtract 12 from both sides of the equation to isolate (1/2)x:
(1/2)x = 18 - 12
(1/2)x = 6
Multiply both sides of the equation by 2 to solve for x:
x = 12
So, it will take Jenny 12 months to grow her hair to 18 inches. reword this

Jenny's hair grows at a rate of 1/2 inch per month. To reach a length of 18 inches, the equation (1/2)x + 12 = 18 is used, where x represents the number of months. By isolating (1/2)x on one side of the equation, it is found that (1/2)x = 6. Mulitiplying both sides by 2 results in x = 12. Thus, it will take Jenny 12 months to grow her hair to 18 inches.