How many twelfths make a half of the circle​

Abag contains 3 red marbles 4 white marbles and 5 blue marbles if one marble is drawn from the bag what is the probability that the marble will be blue

What is the result of adding the system of equations? 2x+y=4 3x-y=6

The holiday party will cost $160 if 8 people attend.if there are 40 people who attend the party, how much will the holiday party cost