Provide an appropriate response.Starting at middle C with a frequency of 260 cps, find the frequency of the note a an octave and a fourth above middle C.
A. 676
B. 716
C. 689
D. 694
Answer: D
Mathematics
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A PDF for a continuous random variable X is given. Use the PDF to find the indicated probability.Find P(27 ? X ? 42).f(x) = 
A. 
B. 
C. 
D. 
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Find the exact value of the expression.
A. - 
B. - 
C. -2
D. -
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Provide an appropriate response.Determine the measure of the acute angle ? for which tan ? = 1.
A. 30° 
B. 90° 
C. 60° 
D. 45° 
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Graph the polar equation.r = -4 sin ?
A. 
B. 
C. 
D. 
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