Divide.- 
÷ 
A. -1
B. - 
C. 
D. 1
Answer: C
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Sketch the level curve z = k for the indicated values of k.z = 
, k = -4, -1, 0, 1, 4
A. 
B. 
C. 
D. 
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%
Solve the problem. Use 3.14 for ?.Find the area of the circular racetrack.(Round to the nearest foot.) r = 75 ft R = 95 ft 
A. 5024 ft2 B. 10,676 ft2 C. 17,663 ft2 D. 28,339 ft2
Simplify. Assume that each variable is nonnegative.8
- 5x
A. 13
B. 3x
C. 8
- 5x
D. 3x