Answer:
(x+4y)(x-4y)
Step-by-step explanation:
Since

we can see that

12
13
78
97
65
90
70
these are numbers with 2 digits
Step-by-step explanation:
Recall that 1 dozen = 12 so 4 dozen cookies has a total of 48 cookies. We are going to use the following ratios to solve the problem:
and 
a) 
b) 18 dozen cookies = 216 cookies

3^3 is equal to 3 * 3 *3, which is equal to 27