Is the first one correct and what are the ages?

Select the correct answer. 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? a. 60 b. 90 c.186 d.187

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16