Answer:50 %
Step-by-step explanation:
Given
There are 4 girls and 6 boys in a club
Probability of choosing 1 girl and 2 boys is

No of ways of choosing 1 girl and 2 boys



i.e. 
Yes,
Every 2 minutes = 3 inches of water, so that means every minute = 1.5 inches of water.
So in 10 minutes:
10*(1.5) = 15 inches of water.
So in 10 minutes the tub will fill an additional 15 inches of water which is exactly how much you need to fill up the remaining tub (3+15 = 18)
Subtract 7 from each side
x=12
B. None of these plants is yet producing actual widgets
Explanation: since number of days is on the x axis, 10 days corresponds to 10 on the x axis. At 10, none of the lines are above 0 on the y axis yet. Since the y axis represents number of widgets, this means none of the plants have produced more than 0 widgets yet.