SOLUTION: Joshua likes to read. He read 6 books when he was 6 years old. Every year he doubled the number of books he read the previous year. How many total books did he read between the age

Question 1102348: Joshua likes to read. He read 6 books when he was 6 years old. Every year he doubled the number of books he read the previous year. How many total books did he read between the ages of 6 and 10?
Found 3 solutions by Lightning_Fast, josmiceli, richwmiller:
Answer by Lightning_Fast(78)   (Show Source): You can put this solution on YOUR website!
Let a = 6, the initial number of books read
Let b = 2, the amount that the value grows by (doubles)

x represents the number of years since age 6
At age 10, that is 10-6 years since age 6, or four years since age 6. So plug in 4 for x.

Now you want to simplify your answer.

Joshua read a total of 96 books between ages 6 and 10.
Answer by josmiceli(19441)   (Show Source): You can put this solution on YOUR website!
Let when he was yrs old
when he was yrs old
Let = number of books he read
from age to age
-----------------------------------------
and

He read 186 books from age to age
------------------------------------------------
check:

OK
Answer by richwmiller(17219)   (Show Source): You can put this solution on YOUR website!
Lightning's answer is for how many books he read at age ten not from 6 to ten

6 12 24 48 96 6 7 8 9 10

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