Find the exact value of the expression.cos 40° cos 20° - sin 40° sin 20°
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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Write the augmented matrix for the system. 4x - 2y = 16 6x + 9y = 72
A. 
B. 
C. 
D. 
Mathematics
Solve.What percent of 55 is 44?
A. 75% B. 125% C. 120% D. 80%
Mathematics
Using a calculator, evaluate the trigonometric functions. Round to four significant digits.tan 558°
A. -0.9511 B. 1.1106 C. 0.3249 D. -0.2126
Mathematics
Use any method (analytic or graphical) to solve the equation. If necessary, round the answer to the nearest thousandth.log x2 = (log x)2
A. {1, 100} B. {0, 1} C. {1, 10.000} D. {1, 2}
Mathematics