Solve the problem.The cost of producing t units is C = 4t2 + 5t, and the revenue generated from sales is R = 5t2 + t. Determine the number of units to be sold in order to generate a profit.
A. t > 5
B. t > 6
C. t > 0
D. t > 4
Answer: D
Mathematics
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B. k = 
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Mathematics