There are 3 red marbles, 5 green marbles, and 2 blue marbles in a bag. which of the following are true?

the probability of randomly drawing either a red marble or a green marble is 80%.
the probability of randomly drawing a red marble and then a green marble is 1/6 .
the probability of not drawing a blue marble is 20%.
the probability of drawing a green marble is the same as the probability of drawing either a red or a blue marble.

Suppose y varies directly with x. write a direct variation equation that relates x and y. then find the value of y when x=12 y=7 when x=3

(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.

I'm confused on how to solve the triangle. can someone me ?