A jar contains 3 yellow and 7 green marbles. You randomly draw one marble from the jar then REPLACE it and randomly draw a second marble. Find the probability that you draw a yellow marble first and then a green marble.

3 yellow + 7 green = 10 total marbles.

The probability of picking a certain color is the number of that color over the total quantity.

Picking yellow would be 3 yellow / 10 total = 3/10

Picking green would be 7 green / 10 total = 7/10

To find the probability of doing both multiply the probability of each one by each other:

3/10 x 7/10 = 21/100

The answer would be 21/100

¿De dónde has sacado el 25 de repente?

Si la ecuación es la primera, el resultado es:

-32= 4x+20x

-32= 24x

x= -32/24

Si la ecuación es la segunda, sería:

-32= 4x+20x+50

-82=24x

x= -41/12