Can someone solve this ASAP?

What is the value of r of the geometric series?

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

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie