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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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Randy03/12/17101010Friendly, prompt, helpful response !!
Randy12/04/16101010Friendly, helpful, courteous response !!
Randy10/15/16101010Courteous, friendly, helpful response !!
Randy09/12/16101010Friendly, helpful, courteous response !!
Randy08/30/16101010I am not familiar with derivatives of .....

Recent Answers from Janet Yang

2017-03-10 Ratio:

I disagree that ratios must use the same units. A common example is the ratio of boys to girls in a classroom, which clearly uses different units.    While you can say "8 mm to 5 ft," it is better to use

2016-11-29 Width Follpw-up:

area of metal = y  area of wood = x-y  y:(x-y) = 25:39  39y = 25(x-y) = 25x - 25y  64y = 25x  y = (25/64)x  y = √((25/64)x) = (√25/√64)√x = (5/8)x    w = (x - y)/2

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 - 3secθtanθ = (secθ -tanθ) (sec⁴θ + secθtanθ + tanθ) - 3secθtanθ  = ((1+tanθ) - tanθ) (sec⁴


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