Solve the problem.If cos ? = - 
, and ? terminates in quadrant II, then find cos 2?.
A. 
B. - 
C. - 
D. 
Answer: B
Mathematics
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Solve.The pitch P of a musical tone varies inversely as its wavelength W. One tone has a pitch of 221 vibrations per second and a wavelength of 15.8 ft. Find the wavelength of another tone that has a pitch of 213 vibrations per second. Round to the nearest hundredths when necessary.
A. 0.06 ft B. 2979.3 ft C. 16.39 ft D. 1.64 ft
Mathematics
Use the given graph to find the x-intercepts.
A. -4, -1 B. -4, 1 C. -1, 4 D. 1, 4
Mathematics
Simplify the expression.(-4)2 ? 80
A. -16
B. 
C. - 
D. 16
Mathematics
Find the quotient 
of the complex numbers. Leave answer in polar form.z1 = 4iz2 = -6 + 6i
A. 
B. 
C. 
D. 
Mathematics