I know how to figure most of it out but when simplifying the parentheses how do you handle the outside 5 when it cannot go into the 6 ? Please show work

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

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

How do you write y-10=2 (x-8) in standard form