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: He can have 12 fifty-dollars bills and 7 ten-dollar bills.
Step-by-step explanation:
12*50=700
7*10=70
_____+
770
5x+3y=17
3y=-5x+17
y=-5/3y + 17/3
Graph if it asks.
Answer:
x = 0.5y^2 - 5.
Step-by-step explanation:
2x=y^2-10
Divide both sides by 2:
x = 0.5y^2 - 5
Answer:
13 Adults and 6 Kids
Step-by-step explanation:
13*9 = $117
6*5.5 = $33
$117 + $33 = $150