Change the decimal to a percent.0.686
A. 68.6%
B. 686%
C. 0.686%
D. 0.0686%
Answer: A
Mathematics
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Solve the problem.A sample of 200 grams of radioactive substance decays according to the function 
where t is the time in years. How much of the substance will be left in the sample after 40 years? Round your answer to the nearest whole gram.
A. 0 grams B. 1 gram C. 2465 grams D. 58 grams
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Graph the inequality.y ? 3x 
A. 
B. 
C. 
D. 
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Find dy/dx by implicit differentiation.xy + x + y = x2y2
A. 
B. 
C. 
D. 
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Find the area of the surface obtained by rotating the circle about the line 
about the line y=7.
Mathematics