Factor completely.x2 - 9x - 22
A. (x - 2)(x + 11)
B. Prime
C. (x + 2)(x - 11)
D. (x - 2)(x + 1)
Answer: C
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As part of a statistics project, a 6th grade teacher brings to class a container with 200 red marbles and 800 white marbles which are thoroughly mixed. To figure out how many marbles in the container are red without actually counting them all, a student randomly draws 150 marbles from the container. Of the 150 marbles drawn, 33 are red.The sampling method used in this example is called
A. random sampling, but not simple random sampling. B. quota sampling. C. stratified sampling. D. simple random sampling. E. none of these
Solve the equation.10y + 10 = -7 - 6y
A. 
B. 
C. - 
D. - 
Solve the problem.Suppose a life insurance policy costs $28 for the first unit of coverage and then $7 for each additional unit of coverage. Let C(x) be the cost for insurance of x units of coverage. What will 10 units of coverage cost?
A. $70 B. $42 C. $98 D. $91
Solve the problem.Sarah has grades of 90 and 97 on his first two tests. If she wants an average of at least 90 after her third test, what score must she make on that test?
A. 83 or more B. 94 or more C. 92 or more D. 90 or more