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Mr. Brown's class is collecting books for a book drive. They started with 2 books. On the first day, they had 6 books. On the second day they had 18 books. Write an equation that models this situation.

A)
y = 4x + 2


B)
y = 2(3)x


C)
y = 3x + 2


D)
y = x2 + 2

Respuesta :

irspow
(0,2), (1,6), (2,18)

6/2=18/6=3 so these points form a geometric sequence or exponential function with a common ratio or base of 3.

y=ab^x

y=a(3^x)  we know that when x=0, y=2 so

2=a(3^0)

2=a so

y=2(3)^x

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