Evaluate each expression without using a calculator. Give the result in degrees.csc-1 (2)
A. 420°
B. 30°
C. 60°
D. -30°
Answer: B
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All references are to the figure below. The distance between A and P is x, and the distance between A and C is y. 
Assuming that y = 87 and r = 40. find A and x.
A. A ? 20°, x ? 50 B. A ? 20°, x ? 60 C. A ? 25°, x ? 56 D. A ? 25°, x ? 55
Express the integrand as a sum of partial fractions and evaluate the integral.
dx
A. ln 
- 
tan-1 
+ C
B. ln 
- 
+ C
C. - 
tan-1 
- 
+ C
D. ln 
- 
tan-1 
- 
+ C
Factor the trinomial completely.8x4 + 17x2 - 21
A. (8x2 + 3)(x2 - 7) B. (8x2 + 7)(x2 - 3) C. (8x2 - 7)(x2 + 3) D. prime
Solve the problem.In chemistry, the pH of a substance is defined by 
where 
is the hydrogen ion concentration in moles per liter. Find the 
of a sample of lake water whose 
is 3.05 × 10-9 moles per liter. (Round to the nearest tenth.)
A. 6.4 B. 7.3 C. 8.5 D. 10.1