Use basic identities to simplify the expression.cos ? - cos ? sin2?
A. tan2?
B. sin ?
C. sec2?
D. cos3?
Answer: D
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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 problem.How long will it take for $3600 to grow to $47,900 at an interest rate of 8.2% if the interest is compounded quarterly? Round the number of years to the nearest hundredth.
A. 127.54 yr B. 31.89 yr C. 32.84 yr D. 163.92 yr
Add.
A. 1021 B. 1611 C. 1122 D. 1101
Solve.Use the given graph of y = x2 + 4x - 3 to solve x2 + 4x - 3 = 0.
A. 1, 3 B. -1, 3 C. -3, -1 D. -3, 1