None of the above. The first two are slope-intercept, whereas the third one isn't a form.
Corey will use 12 tablespoons
Since 4 tablespoons are in each 1/4 of a cup
The sum of 18 and 3 is 21

Step-by-step explanation:
Given polynomials are:

Both polynomials have to be multiplied. We will use distributive property for the said purpose
So,

Combining alike terms

Hence,

Keywords: Polynomials, Multiplication
Learn more about polynomials at:
#LearnwithBrainly