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Subhotosh Khan
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Subhotosh Khan
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Join Date
06-18-2007
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Today
07:46 AM
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Yesterday,
03:20 PM
Subhotosh Khan
replied to a thread
Polar Equation conversion
in
Intermediate/Advanced Algebra
You almost had it!! x^2 + y^2 = 2R - Rcos(Θ) x^2 + y^2 = 2R - x = 2R ....... square again ^2 = 4(x^2 + y^2)
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1 replies | 48 view(s)
05-24-2018,
03:24 PM
Subhotosh Khan
replied to a thread
Find the magnitude of the vector v=<5,-7> to the nearest whole value
in
Intermediate/Advanced Algebra
Do you know how to use Google and look for answer?
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6 replies | 79 view(s)
05-24-2018,
12:11 PM
Subhotosh Khan
replied to a thread
Find the magnitude of the vector v=<5,-7> to the nearest whole value
in
Intermediate/Advanced Algebra
Do you know how to calculate the magnitude of a vector V = <a,b>? What does your class notes say? What does Google say?
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6 replies | 79 view(s)
05-24-2018,
09:06 AM
Subhotosh Khan
replied to a thread
Rounding off to correct significant figure: If we add 3.46 and 2.3 we get 5.76....
in
Beginning Algebra
Rounding-off is an economical decision which depends on the application. You may want to carry a large number of significant digits while designing...
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13 replies | 287 view(s)
05-24-2018,
07:51 AM
Subhotosh Khan
replied to a thread
If I differentiate each of numerator, denominator, is result equal to orig fraction?
in
Calculus
That statement, in general, holds true ONLY for multiplication (and division).
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4 replies | 110 view(s)
05-23-2018,
02:29 PM
Subhotosh Khan
replied to a thread
Derivative and Maximum of a exponential function (study time and learning rate)
in
Calculus
a) After you calculated dQ/dt - it is an algebra problem! Can you "simplify" the term "40 - Q", from the knowledge Q = 40*.
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2 replies | 73 view(s)
05-23-2018,
09:54 AM
Subhotosh Khan
replied to a thread
Derivative of Area: Why does dA/dr relate to circ. or dV/dr relate to surface area?
in
Calculus
Quick answer is that circles and squares have different properties. That is why (dA/dr = C) circle gives you the maximum enclosed area for a given...
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4 replies | 104 view(s)
05-23-2018,
09:29 AM
Subhotosh Khan
replied to a thread
Solve cos(2x+1) + cos(3x+2) + cos(x+1) = 0
in
Intermediate/Advanced Algebra
What are your thoughts regarding the assignment? Please share your work with us ...even if you know it is wrong. If you are stuck at the...
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4 replies | 102 view(s)
05-23-2018,
05:49 AM
Subhotosh Khan
replied to a thread
Initial Velocity Vector and Diagram from Parametric Equation
in
Intermediate/Advanced Algebra
v2=0.6272732+1.965782 ................ What is v2?
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2 replies | 52 view(s)
05-22-2018,
05:35 PM
Subhotosh Khan
replied to a thread
What will the sex ratio in this country be? More males or females?
in
Probability / Statistics
In family with no child M = F In family with 1 child M < F In family with 2 children M = F In family with 3 children M > F In family with...
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15 replies | 272 view(s)
05-21-2018,
03:15 PM
Subhotosh Khan
replied to a thread
Equation of tangent line to (6-2x)^1/2 at x=1
in
Calculus
y = (6-2x)^1/2 dy/dx = 1/2 *(-2) * (6-2x)^(-1/2) at x = 1 → dy/dx = -1/2 and y = 2 equation of the tangent line: y - 2 = (-1/2) * (x - 1)...
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5 replies | 145 view(s)
05-21-2018,
07:49 AM
Subhotosh Khan
replied to a thread
Please help me solve this integral
in
Calculus
Apply integration by parts again on the resulting integral.
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8 replies | 158 view(s)
05-21-2018,
07:46 AM
Subhotosh Khan
replied to a thread
Please help me solve this integral
in
Calculus
No .... that does not work here....
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8 replies | 158 view(s)
05-21-2018,
07:40 AM
Subhotosh Khan
replied to a thread
solve the inequality e^x - ln(x) <= e/x for x
in
Calculus
First step - simplify e^ln(x) = ?? Second step - What is the domain of the expression above? continue....
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6 replies | 161 view(s)
05-20-2018,
08:27 PM
Subhotosh Khan
replied to a thread
solve the inequality e^x - ln(x) <= e/x for x
in
Calculus
What are your thoughts regarding the assignment? Please share your work with us ...even if you know it is wrong. If you are stuck at the...
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6 replies | 161 view(s)
05-20-2018,
08:23 PM
Subhotosh Khan
replied to a thread
Maximize Profit (Calc I): C(x)=x^3-60x^2+1400x+1000 for 0<=x<=50
in
Calculus
For 'x' units sold: Profit = 563*x - (x^3-60x^2+1400x+1000) Now maximize it!
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2 replies | 78 view(s)
05-20-2018,
01:32 PM
Subhotosh Khan
replied to a thread
Fundamental theorem of algebra question: Why/how does q(x) = a_n ?
in
Beginning Algebra
You did answer it yourself!!!
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7 replies | 224 view(s)
05-20-2018,
06:57 AM
Subhotosh Khan
replied to a thread
Want to get better at algebra
in
Intermediate/Advanced Algebra
Welcome.... Two of the resources: purplemath.com KhanAcademy videos There are some simple strategies for "isolating" variables.
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2 replies | 102 view(s)
05-19-2018,
08:59 PM
Subhotosh Khan
replied to a thread
Equal trapazoids around the circumference of a circle
in
Geometry and Trig
What is the outer circumference of the deck? = Pi * (484) Divide that into 17 equal parts. What do you get?
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2 replies | 145 view(s)
05-19-2018,
08:16 PM
Subhotosh Khan
replied to a thread
Help w/ composition fcns f(g(x)), g(f(x)), given f(x) = (2/x), g(x) = x^2+x-1
in
Intermediate/Advanced Algebra
Does x = 0.75 satisfy your equation 2x^2 = -x^4 + x^3 + 7x^2 + 2x - 4]?
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7 replies | 220 view(s)
05-19-2018,
06:16 PM
Subhotosh Khan
replied to a thread
Proof help! integration -
in
Calculus
You are being asked: If y =\sqrt{ r^2 - x^2} (a) \frac{dy}{dx} = ? (b) Show that: \displaystyle{\int_{-r}^{+r}...
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1 replies | 100 view(s)
05-19-2018,
02:02 PM
Subhotosh Khan
replied to a thread
How to find the minimal distance between a 2D point and a 2D line?
in
Beginning Algebra
Determine the equation of the line through points (-10, -12) and (5, 3). Then calculate the perpendicular distance of the line from the...
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1 replies | 95 view(s)
05-19-2018,
01:58 PM
Subhotosh Khan
replied to a thread
Old account issue: please help
in
Administration Issues
I have deleted all the "personal" profile info from the profile page of Marshall1432. Do you think that is sufficient?
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10 replies | 511 view(s)
05-19-2018,
12:32 PM
Subhotosh Khan
replied to a thread
Old account issue: please help
in
Administration Issues
Send me your old user ID. I'll see what I can do.
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10 replies | 511 view(s)
05-19-2018,
11:58 AM
Subhotosh Khan
replied to a thread
solve eqn w/ variable in exponent using logarithms: 10*2^x - 8*5^(x-2) = 0
in
Intermediate/Advanced Algebra
solve: 10 * 2^x - 8 * 5^(x-2) = 0 2^(-2) * 2^x - 5^(-1) * 5^(x-2) = 0 Continue.....
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11 replies | 339 view(s)
05-19-2018,
11:49 AM
Subhotosh Khan
replied to a thread
Old account issue: please help
in
Administration Issues
This is Subhotosh Khan. I have been volunteer/mod for this forum for multiple years. However, I do not know the "mechanics" of totally...
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10 replies | 511 view(s)
05-19-2018,
09:49 AM
Subhotosh Khan
replied to a thread
Help w/ composition fcns f(g(x)), g(f(x)), given f(x) = (2/x), g(x) = x^2+x-1
in
Intermediate/Advanced Algebra
This equation does not have "rational roots". The only way I see to solve this is through numerical methods.
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7 replies | 220 view(s)
05-18-2018,
07:46 AM
Subhotosh Khan
replied to a thread
AS paper: Prove every prime > 5, when raised to 4th power, ends in 1
in
Intermediate/Advanced Algebra
I suggest we should let the OP discover the answer with nudge and help. Denis - you are trying to be new Soroban.......
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8 replies | 245 view(s)
05-18-2018,
07:40 AM
Subhotosh Khan
replied to a thread
Please HELP !! Propositional Logic: Demonstrate this: (p ∧ q) ↓ q ≡ ¬q
in
Intermediate/Advanced Algebra
Do you know the meaning of those symbols? What does your class-notes say?
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2 replies | 132 view(s)
05-18-2018,
07:35 AM
Subhotosh Khan
replied to a thread
Sigma Q: sum[k=1,4]5k^2 (don't understand their solution ?)
in
Intermediate/Advanced Algebra
From knowing a-priori: 1 + 22 + 32 + 42.....+ (n-1)2 + n2 = 1/6 * n * (n+1) * (2n+1) Do a google-search on "sum of square series" for detailed...
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2 replies | 207 view(s)
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About Subhotosh Khan
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“... mathematics is only the art of saying the same thing in different words” - B. Russell
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07:46 AM
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