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
Answer: D
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The equation gives the position s = f(t) of a body moving on a coordinate line (s in meters, t in seconds).s = 8 + 5 cos tFind the body's acceleration at time t = ?/3 sec.
A. 
m/sec2
B. - 
m/sec2
C. - 
m/sec2
D. 
m/sec2
Find an equivalent expression by factoring.7m - 21n + 14
A. 7(m - 3n + 2) B. 7(m - 21n + 14) C. 7(m - 3n + 14) D. 21(7m - n + 14)
Find the exact value of the expression.tan 255°
A. 
+ 2
B. 
- 2
C. -
+ 2
D. -
- 2
If the following defines a one-to-one function, find its inverse. If not, write "Not one-to-one."{(-6, -17), (-17, 14), (1, 4)}
A. Not one-to-one B. {(-17, -6), (14, -17), (4, 1)} C. {(-6, 14), (-6, -17), (4, 1)} D. {(-17, -6), (1, -17), (4, 14)}