if zoey has a bag of marbles containing 18 red marbles, how many blue marbles should she add to the bag so that the probability of her drawing a blue marble from the bag is 1/4

6

Step-by-step explanation:

18/3 = 6

Add 6 blue marbles to create four sets of 6 marbles . Since only one set of the four are blue marbles , she'd have 1/4 chance of getting one .

location: point 0

step-by-step explanation:

well, -8 to 10 on a number line is 18 spaces.

1/9 of 18 is 2.

so, 4/9 of 18 must be 8.

8 spaces from -8 (a) is 0.

so, 4/9 of the way from -8 to 10 is 0!