Mr. martinez orders 250 key chains printed with his athletic teams logo and 500 pencils printed with their web address. write an algebraic expression that represents the cost of the order.

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

2x - 20 = 32 20 - 3x = 8 6x - 8 = 16 -13 - 3x = -10

Three times the sum of a number and seven is negative thirty-six. what is the number?