Solve the problem.A repair company's charge for repairing a certain type of copy machine fits the model 
where y is the amount charged in dollars and x is the number of minutes the repair person is on the job. How many minutes would it take for the cost of repair to reach $120? (Round to the nearest minute.)
A. 187 min
B. 12 min
C. 271 min
D. 118 min
Answer: D
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Use logarithmic differentiation to find the derivative of y with respect to the independent variable.y = 4t
A. 4t
B. 
C. 
D. 
Use both properties of equality to solve the equation.14 = 2 - 4m
A. -12 B. -3 C. -1 D. -8
Evaluate the determinant.
A. 4 - 28x B. 28x - 4 C. 0 D. 28x
Solve the problem.A firm making microwave ovens finds that the total cost, C(x), of producing x units is given by C(x) = 55x + 600.The revenue, R(x), from selling x units is determined by the price per unit times the number of units sold, thus R(x) = 65x.Find and interpret (R - C)(42).
A. $180 profit, income exceeds cost B. $5640 profit, income exceeds cost C. $102 profit, income exceeds cost D. -$180 loss, cost exceeds income