Register
Help
Remember Me?
What's New?
Forum
New Posts
FAQ
Calendar
Community
Member List
Forum Actions
Mark Forums Read
Quick Links
Today's Posts
View Site Leaders
Math Lessons by Subject
Calculators/Solvers
Advanced Search
Member List
Subhotosh Khan
If this is your first visit, be sure to check out the
FAQ
by clicking the link above. You may have to
register
before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.
Subhotosh Khan
Elite Member
Find latest posts
Find latest started threads
Mini Statistics
Join Date
06-18-2007
Last Activity
Yesterday
04:36 PM
Tab Content
Subhotosh Khan's Activity
About Me
Tab Content
All
Subhotosh Khan
Photos
New Activity (
)
Please reload this page to view the 200+ new activity items that have been created.
Older Activity
11-14-2018,
11:33 AM
Subhotosh Khan
replied to a thread
Linear Inequality Word Problem
in
Beginning Algebra
Start with naming variables whose values you need to estimate. In this case, Let mother's present age = M Mother's age nine years ago = M -...
see more
1 replies | 115 view(s)
11-12-2018,
07:16 PM
Subhotosh Khan
replied to a thread
Simple Trig Proof
in
Geometry and Trig
sin^2(θ) + cos^2(θ)=1 sin^2(θ) = 1 - cos^2(θ) ^2 = ^2 sin^4(θ) = 1 - 2*cos^2(θ) + cos^4(θ) continue...
see more
3 replies | 244 view(s)
11-12-2018,
06:36 PM
Subhotosh Khan
replied to a thread
For any positive integer n, ....
in
Intermediate/Advanced Algebra
That is factorial. Do you know what that is?
see more
3 replies | 239 view(s)
11-12-2018,
07:45 AM
Subhotosh Khan
replied to a thread
Big matrix with a column of zeros
in
Intermediate/Advanced Algebra
What does your text-book say? Google the term "determinant of a matrix". What do you find?
see more
5 replies | 219 view(s)
11-12-2018,
07:41 AM
Subhotosh Khan
replied to a thread
Question for mmm444bot and Denis
in
Math Odds & Ends
"mmm4444bot" is a ro"bot" - you did not know that??!!
see more
5 replies | 251 view(s)
11-12-2018,
07:25 AM
Subhotosh Khan
replied to a thread
Polynomials
in
Intermediate/Advanced Algebra
One way to solve this would be to apply rational root theorem. The other method could be to use synthetic division and divide the given polynomial...
see more
2 replies | 160 view(s)
11-12-2018,
07:13 AM
Subhotosh Khan
replied to a thread
Help with a Complex Equation
in
Beginning Algebra
Suppose you were given: a = b/x ....... then a * x = b .... x = b/a .....
see more
1 replies | 201 view(s)
11-12-2018,
07:09 AM
Subhotosh Khan
replied to a thread
Series Question: Divergence or Converence?
in
Calculus
We generally do not lock post - in case some other person have a "clarifying question" regarding the answers.
see more
6 replies | 250 view(s)
11-11-2018,
07:47 PM
Subhotosh Khan
replied to a thread
Word problem help
in
Arithmetic
Please post work for both the problems. We can investigate properly. In arithmetic, you can arrive at a "correct" answer following an "incorrect"...
see more
5 replies | 287 view(s)
11-11-2018,
07:44 PM
Subhotosh Khan
replied to a thread
Dealing With Negative Fractions
in
Pre-Algebra
.
see more
1 replies | 197 view(s)
11-11-2018,
07:39 PM
Subhotosh Khan
replied to a thread
What do these questions mean?
in
Intermediate/Advanced Algebra
In which class did you get these questions? What is your text-book?
see more
4 replies | 247 view(s)
11-11-2018,
12:34 PM
Subhotosh Khan
replied to a thread
HELP FOR CHILD: Calculus Help with Bullet Problem (h(t)=-4.9t^2+900t+2.4)
in
Calculus
Where exactly is your child "lost"? When bullet hits the ground , Let t = to .............thenh(to) = 0 so s/he needs to solve for to...
see more
3 replies | 233 view(s)
11-10-2018,
05:07 PM
Subhotosh Khan
replied to a thread
Quadratic word prob: 4x4 garden is to be surrounded with rocks evenly on 3 sides
in
Intermediate/Advanced Algebra
I think "evenly" here is translated into "path with constant width". I would decompose it as one rectangle minus a square.
see more
4 replies | 303 view(s)
11-10-2018,
02:26 PM
Subhotosh Khan
replied to a thread
Compound interest: it is found that an investment doubles in 'a' years
in
Finance/Business Math
What are your thoughts? Please share with us
see more
3 replies | 150 view(s)
11-10-2018,
11:42 AM
Subhotosh Khan
replied to a thread
I can't re-arrange this! Make x the subject of 10(x+y) = 5(x-y)
in
Beginning Algebra
You don't HAVE to declare your grade. But if you do, it helps us in writing a grade-appropriate answer.
see more
6 replies | 266 view(s)
11-10-2018,
11:39 AM
Subhotosh Khan
replied to a thread
Quadratic word prob: 4x4 garden is to be surrounded with rocks evenly on 3 sides
in
Intermediate/Advanced Algebra
First draw an approximate sketch of the situation. Let the width of the rock-path = W Then What is the total area of the rectangle (garden...
see more
4 replies | 303 view(s)
11-09-2018,
09:38 PM
Subhotosh Khan
replied to a thread
triangle length vs angles: from phytagoras, AC = 25/3 and AD = 7/3 considring AB = AC
in
Geometry and Trig
Yes .... I did ... looking at the OPs drawing (without thinking through...
see more
9 replies | 336 view(s)
11-09-2018,
01:16 PM
Subhotosh Khan
replied to a thread
Log, Exponential Questions: 3e^x - 5 = -2e^{-x}, 2 ln(x) - 3 ln(1/x) = 10
in
Intermediate/Advanced Algebra
But Jomo he is just a junior member (with ~ 600 posts) - and you are a senior member (with > 2000 psts). So his discovery and usage cannot...
see more
5 replies | 272 view(s)
11-09-2018,
09:19 AM
Subhotosh Khan
replied to a thread
Log, Exponential Questions: 3e^x - 5 = -2e^{-x}, 2 ln(x) - 3 ln(1/x) = 10
in
Intermediate/Advanced Algebra
For problem a) : Hint e^(-x) = 1/e^(x) For problem b) : Hint:
see more
5 replies | 272 view(s)
11-09-2018,
08:47 AM
Subhotosh Khan
replied to a thread
triangle length vs angles: from phytagoras, AC = 25/3 and AD = 7/3 considring AB = AC
in
Geometry and Trig
Now you need to use similar triangle theorems. Let DA= p and AC = h; Then: p/8 = (6+p)/x ... and (h+9)/x = b/8 .... and
see more
9 replies | 336 view(s)
11-09-2018,
06:07 AM
Subhotosh Khan
replied to a thread
Must Improper integral, from -inf to inf, be broken down into 2 separate limits?
in
Calculus
One example would be where the interval includes a vertical assymptote.
see more
6 replies | 398 view(s)
11-08-2018,
02:40 PM
Subhotosh Khan
replied to a thread
Helping Daughter w/ math, this one is stumping me: 2=(ab+c)/a Solve for a.
in
Beginning Algebra
Can you please post the problem "exactly" as it was presented to your daughter.
see more
12 replies | 511 view(s)
11-08-2018,
08:03 AM
Subhotosh Khan
replied to a thread
calc 3 question: 0=<x<=1 -x^2=<y<=x^2 for the function f(x,y) dydx
in
Calculus
Your response is not quite correct. Did you draw an approximate sketch of the region over which you are integrating? If not, do that first.
see more
1 replies | 269 view(s)
11-08-2018,
07:58 AM
Subhotosh Khan
replied to a thread
Ratios: Find the rate or speed as a ratio of distance to time. 1512 miles,8 days
in
Beginning Algebra
You are asked to calculate: (distance)/(time) = ? (leave it as fraction) What is the distance given? What is the time given?
see more
1 replies | 372 view(s)
11-07-2018,
04:36 PM
Subhotosh Khan
replied to a thread
Definite Integration: int[3,9][f(x)]dx = 7; find int[3,9][2*f(x) + 1]dx
in
Calculus
Start with: \displaystyle{\int dx \ = \ a * \int f(x)dx}
see more
4 replies | 396 view(s)
11-06-2018,
03:28 PM
Subhotosh Khan
replied to a thread
Word Problem: a ball and a bat cost 4000 USD together....
in
Beginning Algebra
The second equation should be: L*(1+0.30) + T*(1-0.15)= 4500 Do you see why?
see more
8 replies | 504 view(s)
11-05-2018,
06:39 PM
Subhotosh Khan
replied to a thread
maths: 80,150,850, then blank, then 77,850, on other side, but dont know answer
in
Intermediate/Advanced Algebra
What is the Grade that your son is studying now? What is the "topic" that brought this problem?
see more
5 replies | 348 view(s)
11-05-2018,
08:42 AM
Subhotosh Khan
replied to a thread
Algorithms question: 8 marbles, 2-pan balance; find heavier marble in 3 weighings
in
Intermediate/Advanced Algebra
Did you solve it?
see more
3 replies | 290 view(s)
11-05-2018,
08:36 AM
Subhotosh Khan
replied to a thread
Real Life Scheduling Problem: Saturday and Sunday requires 3 employees...
in
Finance/Business Math
My recommendation for you would be to go to the local university (or community college) and hire a "hungry" graduate student to perform this task -...
see more
1 replies | 204 view(s)
11-04-2018,
01:27 PM
Subhotosh Khan
replied to a thread
Nonlinear Simultaneous equations: c/a+b/c+a=0, a/b+c/a+b=0, b/c+a/b+c=0
in
Intermediate/Advanced Algebra
What are your thoughts? Please share with us
see more
5 replies | 241 view(s)
More Activity
No More Results
No Recent Activity
About Subhotosh Khan
Basic Information
Signature
“... mathematics is only the art of saying the same thing in different words” - B. Russell
Statistics
Total Posts
Total Posts
17,785
Posts Per Day
4.27
General Information
Last Activity
Yesterday
04:36 PM
Join Date
06-18-2007
Referrals
2