Solve the problem.The revenue achieved by selling x graphing calculators is figured to be 
The cost of each calculator is 
How many graphing calculators must be sold to make a profit (revenue - cost) of at least $163.80?
A. {x?23 < x < 37}
B. {x?6 < x < 24}
C. {x?21 < x < 39}
D. {x?22 < x < 20}
Answer: C
Mathematics
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Solve problems using a calculator.The Passive House Standard is a strict building code used as a state guideline for building energy-efficient homes. The total primary energy consumption of a building following this code must not be more than 19,020 Btu per square foot per year. What would this annual maximum be for a 4500-square-foot house?
A. 85,540,000 Btu per year B. 85,590,000 Btu per year C. 85,570,000 Btu per year D. 85,530,000 Btu per year
Mathematics
Determine the total turn for the closed curve. Assign a positive measure to counterclockwise turning.
A. 1080° B. -360° C. 720° D. -1080°
Mathematics
Simplify the expression.
A. 500y16z12
B. 
C. - 
D. 
Mathematics
Subtract.0 - 
A. 
B. 
C. 0
D. 14
Mathematics