Find the probability.A bag contains 13 balls numbered 1 through 13. What is the probability of selecting a ball that has an even number?
A. 
B. 
C. 6
D. 
Answer: A
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Use half-angle identities to find the exact value of the expression.tan 75°
A. 2 + 
B. -2 + 
C. -2 - 
D. 2 - 
Which of the following would you most likely expect from a geometry student who is a naive empiricist?
a. Consulting an authority, like the textbook or the teacher, to determine the truth of the statement, "vertical angles are congruent." b. Refusing to believe the statement, "vertical angles are congruent." c. Being satisfied with the truth of the statement, "vertical angles are congruent" after examining several examples. d. Having an intellectual need for a deductive proof of the statement, "vertical angles are congruent."
Use a sketch to find the exact value of the expression.cos 
A. - 
B. - 
C. 
D. 
Solve the problem.Use the formula R = log
, where the magnitude of an earthquake on the Richter scale is based on I, the measurement of a seismic wave, and I0, the measurement of a seismic wave of a level zero earthquake with the same epicenter. An earthquake was recorded which was 2,511,886 times more powerful than a reference level zero earthquake. What is the magnitude of this earthquake? (Round to the nearest tenth.)
A. 5.4 B. 6.4 C. 0.6 D. 14.7