Solve the variation problem.The voltage across a resistor is jointly proportional to the resistance of the resistor and the current flowing through the resistor. If the voltage across a resistor is 
for a resistor whose resistance is 
and when the current flowing through the resistor is 
find the voltage across a resistor whose resistance is 
when
the current flowing through the resistor is 
A. 32 volts
B. 16 volts
C. 18 volts
D. 8 volts
Answer: B
Mathematics
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Simplify the given expression by giving the results in terms of one-half the given angle. Then use a calculator to verify the result.
A. -0.4226 B. -0.766 C. 0.9063 D. -0.6428
Mathematics
Find the inverse of the function.f(x) = 
A. f-1(x) = 
B. f-1(x) = x2 - 3, x ? 0
C. f-1(x) = (x + 3)2
D. Not a one-to-one function
Mathematics
The given function is one-to-one. Find f-1(x).f(x) = 
A. f-1(x) = 
B. f-1(x) = 
C. f-1(x) = 
D. f-1(x) = 
Mathematics
Perform the arithmetic.
÷ 
A. - 
B. 
C. - 
D. 
Mathematics