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17. At two different times during the summer, Kirsten measured the height of a sunflower she had planted in May. She measured it when she first planted the flower and then again 3 weeks later.
a. Find the slope-intercept equation that represents the height of Kirsten's flower based on the number of weeks since she planted it.
b. Determine exactly how tall the sunflower will be after 8 weeks.
c. How many weeks have passed if the plant is 47 inches tall?