Solve the system by the substitution method.16x2 + 4y2 = 642y - 4x = 8
A. (0, 2), (0, -4)
B. (0, -2), (4, 0)
C. (0, -4), (2, 0)
D. (0, 4), (-2,0)
Answer: D
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Evaluate the expression.(-2)0
A. 0 B. 1 C. -2 D. -1
Solve the problem.Mary and her brother John collect foreign coins. Mary has twice the number of coins that John has. Together they have 120 foreign coins. Find how many coins Mary has.
A. 80 coins B. 16 coins C. 72 coins D. 40 coins
Use synthetic division to find the function value.f(x) = 2x4 - 5x3 - 2x2 - 2x - 2; find f(-2)
A. 90 B. -2 C. -36 D. 66
Use Bayes' rule to find the indicated probability.Two stores sell a certain MP3 players. Store A has 34% of the sales, 5% of which are of defective items, and store B has 66% of the sales, 1% of which are of defective items. The difference in defective rates is due to different levels of pre-sale checking of the product. A person receives a defective item of this product as a gift. What is the probability it came from store B?
A. 0.275 B. 0.22 C. 0.5667 D. 0.7083