81^1/16

Ayuda, gracias!! Con explicación

Volume of a cylinder with a radius of 13 in and height of 30 in

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

Can someone me and do the problem plz so i can understand it more better