Solve the problem. Round to the nearest tenth unless indicated otherwise.The resistance of a wire varies directly as the length of the wire and inversely as the square of the diameter of the wire. A 20 foot length of wire with a diameter of 
has a resistance of 
What would the resistance be for a 
length, with diameter 
of the same kind
of wire ?
A. 368 ohms
B. 375 ohms
C. 372.5 ohms
D. 387 ohms
Answer: B
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Solve the problem.The loudness of a sound is measured in decibels (dB). The loudness L of a sound is related to its intensity I by the equation 
where I0 = 10-12 watts per square meter (W/m2) is the intensity of the faintest sound the human ear can detect. Find the dB level of a radio at average volume from 9 feet away when it has an intensity of 
W/m2.
A. ? 63 dB B. ? 73 dB C. ? 53 dB D. ? 43 dB
Solve the mixture problem.It is necessary to have a 40% antifreeze solution in the radiator of a certain car. The radiator now has 20 liters of 20% solution. How many liters of this should be drained and replaced with 100% antifreeze to get the desired strength?
A. 5 L B. 10 L C. 6.7 L D. 8 L
Solve the problem.Amy buys a sports car and pays a 7% sales tax on the $20,600 sale price. How much sales tax did the person pay?
A. $1236.00 B. $1442.00 C. $1648.00 D. $22,042.00
Evaluate.-(11n)0
A. 1 B. -11 C. -1 D. 0