15. if one apartment requires 36 square yards of carpeting, how many square yards of carpeting do 25 identical apartments require?
a. 936 square yards
b. 900 square yards
c. 27 square yards
d. 61 square yards
16. gina decided to order some clothes from a catalogue. she ordered 3 pairs of jeans at $39 each, 4 t- shirts at $15 each, and 2 skirts at $27 each. what was her total bill?
a. $177
b. $117
c. $231
d. $192
17. what is the correct way to write three hundred nine million, fifty-eight thousand, three hundred four?
a. 309,58,34
b. 395,834
c. 309,058,304
d. 390,580,304

[15 points]find the least common multiple of the expressions: 1. 3x^2, 6x - 18 2. 5x, 5x(x +2) 3. x^2 - 9, x + 3 4. x^2 - 3x - 10, x + 2 explain if possible

(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.

Y=21.95x+10 y=22.45x solve by substitution