Use a calculator to find the function value to four decimal places.cos 16.4°
A. -0.7699
B. 0.2943
C. 0.2823
D. 0.9593
Answer: D
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Write the function in terms of its cofunction. Assume that any angle in which an unknown appears is an acute angle.cot 31.1°
A. tan 148.9° B. cot 58.9° C. tan 31.1° D. tan 58.9°
Simplify the expression by combining any like terms.2x - 9x
A. 11x B. -7x C. -18x D. -7 + x
Solve the problem.In Cairo, Egypt, the average number of protestors in Tahrir Square at any given moment during the anti-Mubarak protests was 74,004. Round the number of protestors to the nearest thousand.
A. 75,000 B. 74,010 C. 74,100 D. 74,000
Find the center, foci, and vertices of the ellipse.16(x + 2)2 + 9(y - 1)2 = 144
A. center at (1, -2)
foci at (1, -2 - 
), (1, -2 + 
)
vertices at (1, 5), (1, -3)
B. center at (-1, 1)
foci at (-1, 1 - 
), (-1, 1 + 
)
vertices at (-1, 5), (-1, -3)
C. center at (2, 1)
foci at (2, 1 - 
), (2, 1 + 
)
vertices at (2, 5), (2, -3)
D. center at (-2, 1)
foci at (-2, 1 - 
), (-2, 1 + 
)
vertices at (-2, 5), (-2, -3)