Factor completely. If the polynomial cannot be factored, say it is prime.x3 - 9x + 5x2 - 45
A. (x - 3)2(x + 5)
B. (x2 - 9)(x + 5)
C. (x + 3)(x - 3)(x + 5)
D. prime
Answer: C
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Solve the problem.The focal length f of a lens with index of refraction n is 
= (n - 1)
where R1and R2 are the radii of curvature of the front and back surfaces of the lens. Express f as a rational expression.
What will be an ideal response?
Draw the given angle in standard position. Draw an arrow representing the correct amount of rotation. Find the measure of two other angles, one positive and one negative, coterminal with the given angle.-85°
A. 175° and -5°
B. 185° and -355°
C. 275° and -445°
D. 85° and -105°
Use an identity to write the expression as a single trigonometric function or as a single number.± 
A. cos 17? B. sin 68? C. cos 68? D. sin 17?
Solve the problem.The table shows enrollment in 2-year technical schools for 1980, 1990 and 2000. Assuming a linear relationship, estimate the enrollment for 1995.
A. 3.2 million B. 1.5 million C. 4.9 million D. 2.3 million