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I can answer questions in Algebra, Basic Math, Calculus, Differential Equations, Geometry, Number Theory, and Word Problems. I would not feel comfortable answering questions in Probability and Statistics or Topology because I have not studied these in depth.

Experience in the area

I tutor students (fifth through twelfth grades) and am a Top Contributor on Yahoo!Answers with over 24,000 math solutions.


Co-author of An Outline of Scientific Writing: For Researchers With English as a Foreign Language


I have a Bachelor's degree in Applied Mathematics from the University of California at Berkeley.

Past/Present Clients

George White Elementary School. Homework Help program at the Ridgewood Public Library, Ridgewood, NJ. Individual students.

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Randy10/15/16101010Courteous, friendly, helpful response !!
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Recent Answers from Janet Yang

2016-07-26 Amount Invested:

B = mA  C = A+B    By substitution, C = A + mA.  By the distributive rule, A + mA = A(1+m).  :::::  D = C+B  By substitution, D = A(m+1) + mA.  By the distributive rule, D = A(2m+1).    It is given that

2016-07-26 Amount Invested:

"A, B, C, and D invest $s."  A+B+C+D = s    "B invests m times as much as A"  B = mA    "C invests as much as A and B combined"  C = A+B = A+(mA) = A(m+1)    "D invests as much as C and B combined"  D

2016-06-29 trignometry:

sec⁶θ - tan⁶θ - 3sec˛θtan˛θ = (sec˛θ -tan˛θ) (sec⁴θ + sec˛θtan˛θ + tan˛θ) - 3sec˛θtan˛θ  = ((1+tan˛θ) - tan˛θ) (sec⁴

2016-05-18 Garden: Width, Area:

I'm assuming that the "outside area" is not part of the garden.    garden area = 80 yd × W yd = 4,840 yd˛  W = 60.5 yd    dimensions of garden plus outside area:  length = 80 + 2×7 = 94 yd  width = 60

2016-04-12 Number of Revolutions- Solution/Explanation:

The solution shows only the end result, after converting unit. It doesn't show the previous steps in which conversion factors are applied and units canceled out. I think would be clearer if the conversion


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