Find the weighted mean. Round to the nearest tenth.
A. 230.1
B. 307.7
C. 253.2
D. 54.2
Answer: A
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Insert <, >, or = between the pair of numbers to make the statement true.
A. > B. = C. <
Suppose a radioactive substance decays according to the formula 
. How long will it take for the substance to decay to half the original amount?
?
A. It will take 5,166 years for the substance to decay to half the original amount. B. It will take 5,277 years for the substance to decay to half the original amount. C. It will take 40 years for the substance to decay to half the original amount. D. It will take 5,622 years for the substance to decay to half the original amount.
Write as an exponential expression.
A. 41/2 B. 42 C. 24 D. 21/4
Find the focus and directrix of the parabola.- 
x2 = y
A. F: (0, 10); D: y = -10 B. F: (0, -10); D: y = -10 C. F: (0, -10); D: y = 10 D. F: (-20, 0); D: x = 10