There are 10 marbles in a bag, and the marbles are either red or blue. eric will randomly choose two marbles from the bag, without replacing the first one. if the probability of both marbles' being red is
2
15, how many red marbles are in the bag?

Let the number of red marbles be r. Now we can write the equation:

Rearranging the above equation and simplifying gives the quadratic:

which factorizes to:
(r - 4)(r + 3) = 0
Therefore r = 4. there are 4 RED marbles in the bag.

Answer for 2: his profit would be $2.88 explanation: you have to first multiply 72 and 0.12 together to get $8.64 once you do that you know how much money the shopkeeper made from selling the candy bars individually. so you have to do 8.64-5.76=2.88 hope that ; )answer for 3: yeah i’m sorry i have no idea what number 3 is. i’m sorry i couldn’t with that.