Solve the problem.A power plant is located on a river that is 650 feet wide. To lay a new cable from the plant to a location in a city 1 mile downstream on the opposite side costs $225 per foot across the river and $150 per foot along the land. Suppose that the cable goes from the plant to a point Q on the opposite side that is x feet from the point P directly opposite the plant. Write a function C(x) that gives the cost of laying the cable in terms of the 
A. C(x) = 225
+ 150(1 - x)
B. C(x) = 225
+ 150(5280 - x)
C. C(x) = 225(650 - x) + 150(1 - x)
D. C(x) = 150
+ 225(5280 - x)
Answer: B
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Solve.In a dc circuit the power P dissipated in the circuit is given by the equation P = R?I2 where R is the circuit resistance in ohms and I is the current in amperes. What current will produce 2420 watts of power in a 20-ohm resistor?
A. 40 amps B. 32 amps C. 15 amps D. 11 amps
Find the unit vector in the same direction as the given vector.v = 5i
A. u = i
B. u = 
i
C. u = 5i
D. u = 25i
Solve the system by the substitution method.
A. 
B. 
C. 
D. 
Solve the problem.Of the coffee makers sold in an appliance store, 4% have either a faulty switch or a defective cord, 1.2% have a faulty switch, and 0.3% have both defects. What is the probability that a coffee maker will have a defective cord given that it has either a faulty switch or defective cord? Round to the nearest thousandth.
A. 0.300 B. 0.012 C. 0.775 D. 0.003