If students look to authorities such as the teacher, the answers in the back of a text, or a calculator to determine mathematical correctness rather than their own reasoning, they can be said to have:
a. External sources of conviction
b. Internal sources of conviction
c. A collapse metaphor
d. An approximation metaphor
Ans: a
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Reduce the fraction to lowest terms.
A. 
B. 
C. 
D. 
Find the vertex, focus, and directrix of the parabola with the given equation.(y - 2)2 = 4(x + 4)
A. vertex: (4, -2) focus: (5, -2) directrix: x = 3 B. vertex: (-4, 2) focus: (-5, 2) directrix: x = -3 C. vertex: (-4, 2) focus: (-3, 2) directrix: x = -5 D. vertex: (2, -4) focus: (3, -4) directrix: x = 1
Find the maximum or minimum value of the given objective function of a linear programming problem. The figure illustrates the graph of feasible points. 
z = -x - 8y. Find maximum.
A. maximum: -42 B. maximum: -20 C. maximum: -34 D. maximum: -27
Classify the angle as acute, obtuse, straight, or right.
A. Right B. Acute C. Obtuse D. Straight