Solve the problem.The total sales in dollars of some small businesses fluctuates according to the equation 
where x is the time in months, with x = 1 corresponding to January, 
and 
Determine the month with the greatest total sales and give the sales in that month.
A. March; $10,700
B. September; $2700
C. June; $6700
D. December; $10,700
Answer: A
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Solve the problem.The grade resistance F of a car traveling up or down a hill is modeled by the equation F = W sin ?, where W is the weight of the car and ? is the angle of the hill's grade (? > 0 for uphill travel, ? < 0 for downhill travel). Find the weight of the car (to the nearest pound) that is traveling on a 
downhill grade and which has a grade resistance of 
lb.
A. 4000 lb B. 4300 lb C. 4100 lb D. 3800 lb
Fill in the blank with the correct inequality symbol.If x < 4, then -2x 
-8.
A. < B. ? C. ? D. >
Solve the system by substitution.
A. (-3, -4), (3, -4) B. (-4, 3), (-3, -4), (3, -4), (4, 3) C. (-4, 3), (4, 3) D. (9, 68), (16, 243)
Solve the system by substitution.3x - 3y = 23x + 3y = 2
A. 
B. 
C. 
D. ?