Answer:
pairs
Step-by-step explanation:
Given
Profit on selling 'x' pairs of shoes is 
Find the derivative of the function to find out the critical points

Thus, for 4 pair of shoes profit is maximize.
Answer:
2/3 is the correct answer
No. The whole numbers are the natural numbers (counting numbers, 1, 2, 3...), but starting with zero instead of one. -1 is an integer but not a whole number.
Answer:
3 parts
Step-by-step explanation:
8/12 = 2/3
Apparently, Karen wants to divide her garden into 3 parts and plant 2 of them in corn.
6561^1/2 (^1/2 means to the power of a half, which is the same as the square root)
9^2
3^4