Rationalize the numerator of the following expression and then simplify your answer.
?
?
A. 
B. 6
C. 216
D. 
E. 
Answer: A
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Find the mean proportional (geometric mean) of 15 and 20.
What will be an ideal response?
Find the nth term {an} of the geometric sequence. When given, r is the common ratio.3, - 
, 
, - 
, 
, ...
A. an = 3 ? 
n-1
B. an = 3 ? 
n + 1
C. an = 3 ? 
n
D. an = 3 ? 
n-1
A starfish population can be modeled by 
, where 
is the number of individuals at time 
/>, 
is the yearly rate of growth, and t is the number of years. Sketch the graph for 
to 
when the growth rate is 2.3% and 
is 2.5 billion. All numbers on the vertical axis are in billions.
A. 
B. 
C. 
D. 
E. 
Solve the problem.DG's Plumbing and Heating charges $50 plus $70 per hour for emergency service. Bill remembers being billed just over $250 for an emergency call. How long to the nearest hour was the plumber at Bill's house?
A. 4 hours B. 15 hours C. 13 hours D. 3 hours