Find the exact value of the expression.cos 40° cos 20° - sin 40° sin 20°
A. 
B. 
C. 
D. 
Answer: D
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Create the required linear function an use it to answer the question.Persons taking a 30-hour review course to prepare for a standardized exam average a score of 620 on that exam. Persons taking a 70-hour review course average a score of 795. Based on these two data points, create a linear equation for the function that describes how score varies as a function of time. Use this function to predict an average score for persons taking a 54-hour review course. Round your answer to the tenths place.
A. 739.0 B. 717.7 C. 725.0 D. 729.2
Solve the problem. Round to the nearest tenth of a percent.Find the annual percentage yield APY corresponding to the given rate of 5% compounding daily (ignoring leap year).
A. 5.6% B. 5% C. 5.1% D. 5.3%
Form a polynomial f(x) with real coefficients having the given degree and zeros.Degree: 4; zeros: 1, -1, and 4 - 2i
A. f(x) = x4 + 8x3 + 16x2 - 8x - 17 B. f(x) = x4 + 8x3 + 16x2 - 8x + 17 C. f(x) = x4 - 8x3 + 16x2 + 8x - 17 D. f(x) = x4 - 8x3 + 16x2 + 8x + 17
Complete the ordered pair for the given equation.y = -4x - 24(-8, )
A. (-8, -24) B. (-8, 3) C. (-8, 8) D. (-8, -8)