Solve the problem.The amount of particulate matter left in solution during a filtering process is given by the equation 
where n is the number of filtering steps. Find the amounts left for 
and 
(Round to the nearest whole number.)
A. 400, 100
B. 400, 13
C. 400, 1600
D. 800, 100
Answer: A
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Solve the problem.Find the derivative of the function 
at the point 
in the direction in which the function increases most rapidly.
A. 
B. 
C. 
D. 
Find the number of subsets of the set.{x | x is an even number between 19 and 37}
A. 256 B. 68 C. 8 D. 512
Compare the graph of the given quadratic function f with the graph of y = x2.f(x) = 7x2
A. Reflected across the x-axis and wider B. Wider C. Narrower D. Reflected across the x-axis and narrower
Solve the problem.The time of a telephone call (in minutes) to a certain town is a continuous random variable with a probability density function defined by 
for 
Find the probability that the call lasts more than 3 minutes.
A. 0.0027 B. 0.8736 C. 0.9986 D. 0.0014