Without experience that would help you recognize it right away, I think
you would just need to try numbers until you find it.
Pick a number, multiply it by itself with pencil and paper, and see if it works.
(2)² = 4 too small
(3)² = 9 too small, and not growing fast enough; this could take all day
(10)² = 100 still too small
(15)² = 225 oops, too big; go back down
(12)² = 144 too small
(14)² = 196 too big
(13)² = 169 just right; hope the bears don't come back too soon
1/2 would be rounded to 1 and 4/6 would be rounded to 1
Answer:
The shop can cut the cost of production per sandwich to $3.75. The revenue function would then be defined as R(x)=9x.
Step-by-step explanation:
We want to make as big profit as possible by making as little sandwiches as possible. This means that we want the profit, which is 
to be as big as possible.
For the first choice the profit per sandwich is 
dollars.
For the second choice the profit per sandwich is 
dollars.
For the third choice the profit per sandwich is 
dollars.
We see here that for the second choice the profit is greatest, therefore this choice is most suitably correct.
If 22% are sixth graders, then the rest must not sixths graders.
100% of the school - 22% sixth grades = 78% are not sixths graders
The cost for 9 lbs would be 63 dollars
