Total marbles = 2 + 7 = 9
P(Purple, then white) = (7/9)(2/8) = 7/36
Answer: 7/36
C...................................................................................................................................
Answer: -4/7
Step-by-step explanation:
To find the slope, let's change the equation to slope-intercept form.
[subtract both sides by 4x]
[divide both sides by 7]

Now, we know the slope is -4/7.
Answer:
500 meters =20men =10days
To get the factor 500/(20*10)= 5/2 meters/day
For 50 men and 5days we don't know the meters
So we go by 50*(5/2)*5 =625meters