Use a calculator with a 
key to solve the problem.The function f(x) = 90e-0.2x + 10 models the percentage of information, f(x), that a particular person remembers x weeks after learning the information. a) Substitute 0 for x and, without using a calculator, find the percentage of information remembered at the moment it is first learned. b) Find the percentage of information that is remembered after 4 weeks. Round to the nearest thousandth of a percent.
A. a) 10%; b) 10.449%
B. a) 50%; b) 210.299%
C. a) 90%; b) 40.440%
D. a) 100%; b) 50.440%
Answer: D
Mathematics
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A. 28xy
B. 2x4y2
C. 2x2y
D. 4x2y
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