Solve the problem.Find a so that the vectors v = i - aj and w = 2i - 3j are orthogonal.
A. 
B. - 
C. - 
D. 
Answer: C
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Write the negation of the proposition.Everyone is asleep.
A. Not everyone is asleep. B. Nobody is awake. C. Everyone is awake. D. Nobody is asleep.
Test the equation for symmetry with respect to the given axis, line, or pole.r = 6 + 2 sin ?; the line ? = 
A. May or may not be symmetric with respect to the line ? = 
B. Symmetric with respect to the line ? = 
Solve the problem.The sound produced by touching each button on a touch-tone phone is described by y = sin 2?lt + sin 2?htwhere l and h are the low and high frequencies (cycles per second) in the figure shown.
Describe the sound emitted by touching the 0 key as a product of sines and cosines.
A. y = 2 sin(395?t) cos(2277?t) B. y = 2 sin(536?t) cos(2418?t) C. y = 2 sin(2418?t) cos(536?t) D. y = 2 sin(2277?t) cos(395?t)
Solve the problem.Claire Hummell bought 2 Hecht Company (HCO) bonds maturing in 2032. According to the bond table, the last price is listed as 98.375. With a sales commission of $1 per bond, find the total purchase price.
A. $1,965.50 B. $1,016.25 C. $1,967.50 D. $1,969.50