The "forgetting curve" for memorizing nonsense syllables is given by
?
, 
,
?
where R is the percentage who remember the syllables after t seconds.
?
In how many seconds to the nearest second would only 15 % 
of the students remember?
?
A. 
B. 
C. 
D. 
E. 
Answer: E
Mathematics
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Solve the problem.If cos A = - 
and sin B = 
, with A and B in quadrant II, then find sin(A + B).
A. 
B. - 
C. 
D. - 
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Write the expression without using absolute value symbols.
?
Fill in the blank(s) with the appropriate word(s).
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Add.7302 + 862 + 9
A. 8273 B. 8183 C. 8158 D. 8173
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Solve the problem.How many different 3-letter codes are there if only the letters A, B, C, D, E, F, G, H, and I can be used and no letter can be used more than once?
A. 729 B. 84 C. 3 D. 504
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