Using the it's concept, the correct calculation for the probability of choosing a red grape and then without putting the red grape back into the bowl, choosing a green grape is:

<h3>What is a probability?</h3>
A probability is given by the <u>number of desired outcomes divided by the number of total outcomes</u>.
In this problem, we have that there is a total of 6 + 10 + 8 = 24 grapes. For the first grape, 10 are red, hence the probability that the first grape is red is:

For the second grape, considering that the first was red and was removed, there will be 23 grapes, out of which 6 will be green, hence the probability that the second grape is green is:

Hence the correct expression is found as follows:

More can be learned about probabilities at brainly.com/question/14398287
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7 hours at 60 mph means 7 hours * 60 mph = 420 miles
He will drive 420 miles per day.
To find the number of days, we divide 3000 miles by 420 miles per day.
3000/420 = 7.14
Since the answer is more than 7 days, he needs at least 8 days for his trip.
The answer is D. He has to buy less than or equal to 4 masks
The answer is either 20 or 12