Express the following sums using sigma notation. a. 9 plus 11 plus 13 plus 15 plus ... plus 99 b. 4 plus 10 plus 16 plus ... plus 52 c. 3 plus 8 plus 13 plus ... plus 63 d. StartFraction 1 Over 1 times 7 EndFraction plus StartFraction 1 Over 2 times 8 EndFraction plus StartFraction 1 Over 3 times 9 EndFraction plus ... plus StartFraction 1 Over 49 times 55 EndFraction

Which of the points a(6, 2), b(0, 0), c(3, 2), d(−12, 8), e(−12, −8) belong to the graph of direct variation y= 2/3 x?

Find the zeros of each function. f(x) = x^2 + 5x - 6

(50 ) mrs. julien’s and mrs. castillejo’s classes are selling cookie dough for a school fundraiser. customers can buy packages of macadamia nut chip cookie dough and packages of triple chocolate cookie dough. mrs. julien’s class sold 25 packages of macadamia nut chip cookie dough and 30 packages of triple chocolate cookie dough for a total of $221.25. mrs. castillejo’s class sold 5 packages of macadamia nut chip cookie dough and 45 packages of triple chocolate cookie dough for a total of $191.25. (a) write the system of equations that model the problem. be sure to explain which equation represents which situation. (b) find the cost of each type of cookie. show your work. (c) explain which method you used to solve the system and why you chose that method.