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12. Lisa is taking a chemistry course in which three tests are given. To get a B, she
must average at least 80 on the three tests. She got 86 and 72 on the first two
tests, respectively. Determine in terms of an inequality what scores on the last
test will allow her to get at least a B.
T > 80 B. T ≥ 78 C. T > 82 D. T ≥ 82
13. The solution set for a system of linear inequalities is
A. where the shading overlaps C. anywhere the graph is shaded
B. where the graph has no shading D. anywhere a solid line is
A. I and II B. II and III C. III and IV D. I and IV
15. In an equation where y is expressed in terms of x, the variable x is considered the __________.
A. Dependent variable B. Independent variable C. Relation D. Ordinate
16. Which of the following correspondence is a function?
i. one-to-one ii. one-to-many iii. many-to-one
A. i only B. ii and iii C. ii only D. i and iii
17. Which relation is NOT a function?
A. {(1,-5), (3,1), (-5,4), (4,-2)} C. {(2,7), (3,7), (4,7), (5,8)}
B. {(1,-5), (-1,6), (1,5), (6,-3)} D. {(3,-2), (5,-6), (7,7), (8,8)}
18. Given the time and salary, which of the two is the independent variable?
A. Salary B. Time C. Both D. None of the above
19. Which of the following is NOT a function?
A. y = 2x2 + 3 B. {(1, 2),(2, 3),(3, 5)} C. x2 + y2 = 9 D. y=3x+5
20. What is the domain of the function y=3x–3?
A. (−∞, -∞) B. {x/x } C. [−∞, +∞] D. {y/y }
21. In the given relation, what domain value corresponds to the range value -2?
{(-1,2), (-2,4), (2,5), (0,-2), (2,0)}
A. -2 B. 2 C. 0 D. 4
22. A method of determining whether a graph represents a function or not is
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