Solve using the percentage proportion.What percent of 50 is 20?
A. 96%
B. 192%
C. 40%
D. 20%
Answer: C
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Find at least three nonzero terms [including a0, at least two cosine terms (if they are not all zero) and at least two sine terms (if they are not all zero)] of the Fourier series for the given function.f(x) = x2 + 
-1 ? x < 1
A. f(x) = 
+ 
B. f(x) = - 
+ 
C. f(x) = - 
- 
D. f(x) = 
- 
Solve the problem.If f(x) = -6x + 6 and g(x) = 2x + 7, find g(f(x)).
A. -12x + 48 B. 12x + 19 C. -12x - 5 D. -12x + 19
The measure of a vertex angle in a regular polygon with nine sides is
(a) 140° (b) 220° (c) 1260° (d) 20° (e) 40°
The pH of an acidic solution is a measure of the concentration of the acid particles in the solution, with smaller values of the pH indicating higher acid concentration. In a laboratory experiment, the pH of a certain acid solution is changed by dissolving over-the-counter antacid tablets into the solution. In this experiment, the pH changes according to the equation
,
where x is the number of grams of antacid added to the solution. What is the pH of the solution after the addition of 0.05 grams of antacid tablet?
A. 5.99
B. 4.02
C. -0.85
D. 4.29
E. 5.14