Solve the problem.The revenue achieved by selling x graphing calculators is figured to be 
dollars. The cost of each calculator is 
How many graphing calculators must be sold to make a profit (revenue - cost) of at least $27.50?
A. {x ? 5 < x < 11}
B. {x ? 6 < x < 10}
C. {x ? 7 < x < 9}
D. {x ? 7 < x < 13}
Answer: A
Mathematics
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Solve the problem.An object is thrown upward with an initial velocity of 15 ft per second. Its height is given by 
at time t seconds. After how many seconds does it hit the ground?
A. 6 sec B. 5 sec C. 4 sec D. 2 sec
Mathematics
Provide an appropriate response.Write 11 ÷ 25 in fraction form.
A. 
B. 
C. 
D. 
Mathematics
Write the complex number in rectangular form using exact values if possible. Otherwise, round to one decimal place.5
A. 
+ 
i
B. 
+ 
i
C. 
+ 
i
D. 
+ 
i
Mathematics
Simplify.3
? 
+ 2
? 
A. 6
+ 4
B. 18
C. 20
D. 16
Mathematics