Without using a calculator, give the exact trigonometric function value with rational denominator.cos 30°
A. 
B. 
C. 
D. 
Answer: A
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Solve the problem.Sales of cassette tapes at a local music store decreased approximately linearly from 1,400,000 cassettes in 1988 to 11,000 cassettes in 1993. Find the rate of change of sales per year.
A. 277,800 cassettes per year B. -2580 cassettes per year C. -277,800 cassettes per year D. -27,780 cassettes per year
Convert the angle to DMS notation. Round your answer to the nearest second.43.070°
A. 43°4'18'' B. 43°4'7'' C. 43°4'12'' D. 43°4'0''
Provide an appropriate response.Let qA = 50 - 5pA + 6
and qB = 20
× 
be demand functions, where pA and pB are prices for products A and B, respectively. Find all four marginal demand functions.
What will be an ideal response?
Find the inverse, if it exists, of the given matrix.
A. 
B. 
C. 
D. 