Evaluate using a number line.91 + (-95) 
A. -4
B. 186
C. 4
D. -186
Answer: A
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Determine whether the study involves selection bias, participation bias, both selection bias and participation bias, or neither.A researcher published this survey result: "74% of people would be willing to spend 10 percent more for energy from a non-polluting source". The survey question was announced on a national radio show and 1200 listeners responded by calling in.
A. Selection bias only B. No bias C. Participation bias and selection bias D. Participation bias only
Find the limit.
(3x5 - 3x4 + 4x3 + x2 - 5)
A. -177 B. -33 C. -81 D. -113
Write the function in terms of its cofunction. Assume that any angle in which an unknown appears is an acute angle.cos 31.2°
A. sin 58.8° B. cos 148.8° C. sec 148.8° D. sin 31.2°
Find the maximum or minimum value of the given objective function of a linear programming problem. The figure illustrates the graph of feasible points. 
Objective Function: z = -x - 5yFind maximum.
A. maximum: -27 B. maximum: -14 C. maximum: -18 D. maximum: -22