Which of the following expressions is equivalent to (2x + 3(x + y)] - [a(x + y) - 2y]?
A) (1-a)(x + y)
B) (5-a)(x + y)
C) 2x - 2y + (3 - a)(x + y)^2
D) 2x + 2y + (3 - a)(x + y)^2

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

Question part points submissions used suppose that 100 lottery tickets are given out in sequence to the first 100 guests to arrive at a party. of these 100 tickets, only 12 are winning tickets. the generalized pigeonhole principle guarantees that there must be a streak of at least l losing tickets in a row. find l.

X+ y = 5 ; x - y =3 solve using linear combination