Can anyone answer the question how could this question be answered bysomeone without algebra?

How to write 3 tenths and 5 tenths as a decimal

What is best way to getting answer for my exam is

Me! i really need to get this right before 9. prove the divisibility of 7^6+7^5-7^4 by 11. use factoring so you get a number times 11. just tell me the number. i need this done asap