Agroup of tourists spends $156 to rent snorkels and fins. a total of 15 snorkels and 18 pairs of fins are rented. renting a snorkel costs four times as much as renting a pair of fins. how much does it cost to rent a snorkel?

Simplify the expression. -2/5(10+15m-20n)

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.

Which angle of rotation is an angle of rotational symmetry for all figures?