20.18 using the following data, calculate the work done by stretching a spring that has a spring constant of k 300 n/m tox-0.35 m. to do this, first fit the data with a polynomial and then integrate the polynomial numerically to compute the work: f, 103. n , m 0.01 0.05 0 0.028 0.10 0.046 0.15 f, 103.n 0.063 0.082 0.1 0.13 0.35 x, m 0.20 0.25 0.30

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Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9

(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.