Solomon is 9 years younger than his brother. his brother is 21.how old is solomon. write and solve an equation

9. (y^-5)^10y^10 a. y^-60 b. y^60 c. y^-150 d. y^150 find the simplified form of each expression. 10. (4/7^5)^2 a.8/14^10 b.16/49^25 c.16/49y^10 d.8/14y^25 11. determine if the number 3.43 times 10^-6 is written in scientific notation. if not, explain. a. yes; the number is written scientific notation. b. no; the first factor is not a number between 1 and 10. c. no; it is not written as a number times a power of 10

Henry is an avid reader, he devours 90 pages in half an hour how many pages has henry read per minute?

Find the solution set of this inequality. enter your answer in interval notation using grouping symbols. |8x-4| ≤ 12