Find the difference.8 - (-4)
A. 12
B. -12
C. -4
D. 4
Answer: A
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Solve the proportion for the given variable. 
= 
A. 3 B. 6 C. 7 D. 4
Solve the problem.Persons taking a 30-hour review course to prepare for a standardized exam average a score of 620 on that exam. Persons taking a 70-hour review course average a score of 770. Find a linear function S(t), which fits this data, and which expresses score as a function of time.
A. S(t) = 3.375t + 511.5 B. S(t) = 3.75t + 507.5 C. S(t) = -3.75t + 507.5 D. S(t) = 3.375t - 511.5
Solve the system of equations using Cramer's Rule, if applicable.
A. (2, -3) B. (-3, 2) C. ? D. (3, -2)
Solve the problem.In a survey about the number of siblings of college students, the following probability table was constructed: 
What is the probability that a student has 1, 2, or 3 siblings?
A. 0.49 B. 0.31 C. 0.89 D. 0.63