Suppose that research has shown that the probability that a missile penetrates enemy defenses and reaches its target is 0.1. Find the smallest number of identical missiles that are necessary in order to be 90% certain of hitting the target at least once.
?
A. 27
B. 22
C. 20
D. 21
E. 19
Answer: B
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Express the exercise as a system of linear equations, then find the solution. Use a calculator where appropriate.A flat rectangular piece of aluminum has a perimeter of 64 inches. The length is 16 inches longer than the width. Find the width.
A. 8 in. B. 32 in. C. 40 in. D. 24 in.
Use the preference table to answer the question.The preference table shows the results of an election among three candidates, A, B, and 
a. Using the plurality method, who is the winner?b. Is the Condorcet criterion satisfied?
A. candidate C; yes B. candidate A; yes C. candidate B; yes D. candidate A; no
Find the area of the rectangle.
A. 4232 sq ft B. 92 sq ft C. 184 sq ft D. 2116 sq ft
Identify the equation without applying a rotation of axes.4x2 - 7xy + 2y2 + 4x + 3y + 9 = 0
A. hyperbola B. parabola C. ellipse D. not a conic