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Subhotosh Khan
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Subhotosh Khan
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Join Date
06-18-2007
Last Activity
Yesterday
04:53 PM
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Yesterday,
11:42 AM
Subhotosh Khan
replied to a thread
Need help with a problem: arcsin(x-1/2)-arccos(x-1/2)=3pi/2
in
Geometry and Trig
Did you follow the advice given above? Did you calculate: A - B = 3π/2 sin (A - B) = sin(3π/2) continue......
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5 replies | 106 view(s)
Yesterday,
11:36 AM
Subhotosh Khan
replied to a thread
[Solved] How to find length AB? quadrilateral w/ diag=640, 2 angles given
in
Geometry and Trig
So you have solved the problem!! Watch out for units and significant figures in your answers.
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2 replies | 72 view(s)
Yesterday,
09:41 AM
Subhotosh Khan
replied to a thread
Vectors: Magnitude of forces acing on stable object: A = 800kN, B = 650kN, so C = ?
in
Geometry and Trig
That sketch makes the problem solvable! Have you been taught about Cartesian unit vectors?
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6 replies | 151 view(s)
02-22-2018,
01:20 PM
Subhotosh Khan
replied to a thread
Describe how F(x)=(ax+b)/(cx+d) is related to f(x) = 1/x
in
Calculus
Hint: \displaystyle{ax + b \ = \frac{a}{c}*{(cx+d)} \ + \ (b - \ \frac{da}{c})} ... from long division
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4 replies | 112 view(s)
02-22-2018,
08:21 AM
Subhotosh Khan
replied to a thread
Vectors: Magnitude of forces acing on stable object: A = 800kN, B = 650kN, so C = ?
in
Geometry and Trig
Forces are vectors. Those need to have three characteristic properties, when applied to a body. Those are: Magnitude Direction and point of...
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6 replies | 151 view(s)
02-21-2018,
11:51 AM
Subhotosh Khan
replied to a thread
Turning Point
in
Geometry and Trig
By turning point - do you mean - center of rotation? What is the topic in math class that has assigned this problem?
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6 replies | 157 view(s)
02-21-2018,
11:47 AM
Subhotosh Khan
replied to a thread
Find the points on the graph of y=(1/3)x^3 - 5x - 4/x where the tangent is horizontal
in
Calculus
That is correct. What did you get?
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4 replies | 116 view(s)
02-19-2018,
09:11 PM
Subhotosh Khan
replied to a thread
Proving a Quadrilateral is a Parallelogram: Challenge
in
Geometry and Trig
Draw AB = 10 cm and AC = 10 cm and angle BAC = 60°. Draw BD = 6 cm and CD = 6 cm. Did you get a parallelogram? Do you have two sets of...
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4 replies | 157 view(s)
02-19-2018,
05:06 PM
Subhotosh Khan
replied to a thread
Need help understanding these types of problems: fencing 2 side-by-side areas
in
Intermediate/Advanced Algebra
I concur. I saw the OP's attempt at the solution (3x + 2y = 1800) and inferred (never assumed) that a rectangle was "suggested" in class.
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15 replies | 370 view(s)
02-19-2018,
02:57 PM
Subhotosh Khan
replied to a thread
Need help understanding these types of problems: fencing 2 side-by-side areas
in
Intermediate/Advanced Algebra
That logic will not work here because of the fixed (but variable) cost involved.
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15 replies | 370 view(s)
02-19-2018,
02:50 PM
Subhotosh Khan
replied to a thread
Proving a Quadrilateral is a Parallelogram: Challenge
in
Geometry and Trig
Did you draw some figures to investigate? Note that the problem does not mention whether the given congruent sides are adjacent or not! What...
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4 replies | 157 view(s)
02-19-2018,
10:36 AM
Subhotosh Khan
replied to a thread
Need help understanding these types of problems: fencing 2 side-by-side areas
in
Intermediate/Advanced Algebra
Let the total field be L (ft) * W (ft). Let the length of the shared fence be W (ft). Then 3 * 2 * (L + W) + 2 * W = 4800 → 3L + 4W = 2400...
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15 replies | 370 view(s)
02-19-2018,
10:24 AM
Subhotosh Khan
replied to a thread
Parabolic word problem.
in
Intermediate/Advanced Algebra
I believe that equation should be: h(x)= - 16t2 + 15t + 33 (watch that negative sign in front of 16) This is because your 'x' is upward...
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4 replies | 127 view(s)
02-15-2018,
08:50 AM
Subhotosh Khan
replied to a thread
Newton's Method for matrix-valued functions; finding square root of given matrix
in
Advanced Math
What are your thoughts? Please share your work with us ...even if you know it is wrong. If you are stuck at the beginning tell us and we'll...
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1 replies | 268 view(s)
02-14-2018,
12:58 PM
Subhotosh Khan
replied to a thread
A ship has a centrally mounted turbine engine w/ axis of rotation aligned along...
in
Advanced Math
What is gyroscopic couple? What is the mathematical formula that will describe it? This a dynamics problem with rotating axes of reference. ...
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3 replies | 175 view(s)
02-14-2018,
11:55 AM
Subhotosh Khan
replied to a thread
A ship has a centrally mounted turbine engine w/ axis of rotation aligned along...
in
Advanced Math
What are your thoughts? Please share your work with us ...even if you know it is wrong. If you are stuck at the beginning tell us and we'll...
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3 replies | 175 view(s)
02-13-2018,
09:33 AM
Subhotosh Khan
replied to a thread
Need help with factorisation of (x^2+2x)^2-2(x^2+2x)- 3
in
Intermediate/Advanced Algebra
(x^2+2x)^2-2(x^2+2x)- 3 substitute: u = x^2 + 2x, then, (x^2+2x)^2-2(x^2+2x)- 3 = u^2 - 2*u + 3 The above is a quadratic equation in...
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4 replies | 239 view(s)
02-12-2018,
05:29 PM
Subhotosh Khan
replied to a thread
Probability Theory: Imagine there is an election with 5 candidates and 20 voters.
in
Probability / Statistics
What are your thoughts? Please share your work with us ...even if you know it is wrong. If you are stuck at the beginning tell us and we'll...
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5 replies | 218 view(s)
02-11-2018,
05:41 PM
Subhotosh Khan
replied to a thread
Need help w/ expanding cosine fcn: (1/2)theta_1^2 + cos(theta_1) - cos(theta) =
in
Calculus
What is the McLauren series expansion of sin(Θ/2)? After you square it and a bit of tedious algebra - you should be there!
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4 replies | 219 view(s)
02-11-2018,
02:55 PM
Subhotosh Khan
replied to a thread
Need help w/ expanding cosine fcn: (1/2)theta_1^2 + cos(theta_1) - cos(theta) =
in
Calculus
That is a basic trigonometric relation. Do you know the angle addition rules like: cos(A+B) = cos(A) * cos(B) - sin(A) * sin(B)
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4 replies | 219 view(s)
02-11-2018,
11:39 AM
Subhotosh Khan
replied to a thread
Ford sold 2,480,942 new vehicles in 2014, a 29.1% increase over 2010. Find 2010 vol.
in
Intermediate/Advanced Algebra
That is not quite correct. At 2014, the # of vehicles were 29.1% more than the number of vehicles present on 2010. Let us assume the # of vehicles...
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4 replies | 243 view(s)
02-10-2018,
12:33 PM
Subhotosh Khan
replied to a thread
Cryptic Sport?
in
Math Odds & Ends
Write it with "white" ink - and it hides against the white background.
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7 replies | 455 view(s)
02-10-2018,
12:25 PM
Subhotosh Khan
replied to a thread
Need help w/: 1. E(p,m) = Ap−amb, 2. strict concavity/convexity, 3. maximize profit
in
Calculus
What are your thoughts? Please share your work with us ...even if you know it is wrong. If you are stuck at the beginning tell us and we'll...
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2 replies | 213 view(s)
02-09-2018,
01:26 PM
Subhotosh Khan
replied to a thread
Physical Science II - Mph of a dragster at the finish line of a race- ?
in
Calculus
Did you adjust for the length to be converted to meters?
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8 replies | 399 view(s)
02-08-2018,
08:47 PM
Subhotosh Khan
replied to a thread
Alg II / Pre-Calc w/ Logs: Given log_x(y)+log_y(x)=3, find log_x(y^2)+log_y(x^2)
in
Intermediate/Advanced Algebra
2logx(y)+2logy(x) ......... factor out 2 = 2 * x(y)+logy(x)] ...... continue....
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5 replies | 289 view(s)
02-08-2018,
01:11 PM
Subhotosh Khan
replied to a thread
Annual Compound Interest Calculation: "How would years 3 and 4 appear in the above?"
in
Intermediate/Advanced Algebra
.
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6 replies | 309 view(s)
02-08-2018,
11:37 AM
Subhotosh Khan
replied to a thread
Physical Science II - Mph of a dragster at the finish line of a race- ?
in
Calculus
Why did you assume a = 6*g (instead of 5.97*g)? And: Dx = 1000 ft = 304.8 meters
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8 replies | 399 view(s)
02-07-2018,
08:31 PM
Subhotosh Khan
replied to a thread
Annual Compound Interest Calculation: "How would years 3 and 4 appear in the above?"
in
Intermediate/Advanced Algebra
.
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6 replies | 309 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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Last Activity
Yesterday
04:53 PM
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06-18-2007
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