Use the fact that the resistance of a wire carrying an electrical current is directly proportional to its length and inversely proportional to its cross-sectional area.
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If #28 copper wire (which has a diameter of 0.0126 inch) has a resistance of 68.17 ohms per thousand feet, what length of #28 copper wire will produce a resistance of 30.5 ohms?
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A. About 447 ft
B. About 442 ft
C. About 432 ft
D. About 452 ft
E. About 462 ft
Answer: A
Mathematics
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Use a graphing calculator to display the solution of the given inequality or system of inequalities.y > -1 - xy < 5x - x3
A. 
B. 
C. 
D. 
Mathematics
21
- 7
A. 70
B. 14
C. 28
D. 14
Mathematics
Solve the problem.The sales of a new product (in items per month) can be approximated by 
, where t represents the number of months after the item first becomes available. Find the number of items sold per month 33 months after the item first becomes available.
A. 6400 items per month B. 120,000 items per month C. 1000 items per month D. 3400 items per month
Mathematics
Determine the number and type of solutions.x2 - 8x + 7 = 0
A. 1 real solution B. 2 real solutions C. 2 imaginary solutions
Mathematics