positive = greater than 0.
Therefore we have the inequality:
|add 7 to both sides

You multiply the constants 3 * 2 = 6
Add you add the exponents 6 + 1/2 = 13/2
So the answer is 6x^(13/2)
(D)
The total number of calories for 18 cups of milk is 1620 calories.
If two cups of milk is 180 calories then divide 180/2 to find the unit rate.
Then multiply 90 by the number of cups (18) and then you get the total number of calories for that many drinks.
The answer is D. This is because all of the variables must be on one side so it can be factored.