Math - last one
posted by Lacey on .
I just have one more question.
I need to find the equation for the following word problem: a group of yeasts cells grows by 75% every 3 hours. At 9 a.m., there are 200 yeast cells.
Write an equation that models the number of yeast cells after 9 a.m.
So far I've worked out that C=200(1.75)^ , but my book says that it should be ^t/3, I suppose the /3 refers to the 'every three hours' bit, but, I don't understand why. Can someone please help me understand this?