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
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Use properties of exponents to simplify the expression. Express answer in exponential form.7-3 ? 7
A. -3 ? 72 B. 7-3 C. -72 D. 7-2
Two lines intersect with angle ? as shown in the figure.
Find ? to the nearest degree for the two intersecting lines given by 
and 
A. 30° B. 135° C. 173° D. 45°
Evaluate the exponential expression.(-9)2
A. -18 B. 18 C. -81 D. 81
The demand function for a certain brand of compact disc is given by
?
?
where p is the wholesale unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. Determine the consumers' surplus if the wholesale market price is set at $1/disc. Round your answer to the nearest dollar.
?
A. $26,988 B. $26,667 C. $26,454 D. $26,544