Question 1102348
Let a = 6, the initial number of books read
Let b = 2, the amount that the value grows by (doubles)

{{{y = 6(2)^x}}}
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.

{{{y = 6(2)^4}}}

Now you want to simplify your answer.

{{{y = 6(16)}}}

{{{y = 96}}}

Joshua read a total of 96 books between ages 6 and 10.