Solve the system by substitution.0.7x + 0.5y = -1.7 x - 0.8y = 0.6
A. {(-0.1, -0.2)}
B. ?
C. {(-2, -1)}
D. {(-1, -2)}
Answer: D
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What will be an ideal response?
Solve the problem. Use 3.14 for ?.Find the cost to asphalt a circular racetrack if asphalt costs $70 per 100 ft2. (Round to the nearest dollar.) r = 90 ft R = 120 ft 
A. $31,651 B. $13,847 C. $7913 D. $17,804
Solve.Each week a soft drink machine sells x cans of soda for $0.75/soda. The cost to the owner of the soda machine for each soda is $0.10. The weekly fixed cost for maintaining the soda machine is $25/week. Write an equation that relates the weekly profit, P, in dollars to the number of cans sold each week. Then use the equation to find the weekly profit when 92 cans of soda are sold in a week.
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