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

we are given

Let's assume total number of books =y

number of days =x

They started with 2 books

so, first term is 2

second term is 6

third term is 18

we can see that this is geometric series

so, firstly we will find common ratio

total number of terms is x+1

now, we can find nth term

now, we can plug back r

we get

...........Answer