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tkhunny
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tkhunny
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04-12-2005
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Today
03:53 PM
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Today,
03:52 PM
tkhunny
replied to a thread
Parameterize a triangle counter clockwise: F(x, y) = (−y + x2)i + (x − y2)j
in
Calculus
One problem. You get only one "0 <= t <= 1". All three of your segments run simultaneously. That's no good. You must run them consecutively. In...
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3 replies | 32 view(s)
Today,
11:23 AM
tkhunny
replied to a thread
Actuarial method: 60-month fixed installment loan w/ monthly pymt $50.69
in
Finance/Business Math
Have you considered calculating the pieces? Balance at Inception: $2,500.00 1st Payment Due in One Month. Total Payable: 60 * $50.69 = $3,041.40...
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1 replies | 33 view(s)
Yesterday,
07:50 PM
tkhunny
replied to a thread
X + y + z + w = 100
in
Intermediate/Advanced Algebra
Surely there are some additional requirements or descriptions - stating just exactly what it it you want to do? For Example: Integer Solutions?...
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4 replies | 66 view(s)
04-18-2018,
05:27 PM
tkhunny
replied to a thread
1st- & 2nd-order differential eqns: ds/dt= u-gt, 60 d^2x/dt^2 + 500dx/dt + 900x = 0
in
Differential Equations
u is a value. Just keep it along for the ride. It is not one of your variables of interest and it is not a function of either of them. Did...
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1 replies | 96 view(s)
04-17-2018,
07:40 AM
tkhunny
replied to a thread
A coin is tossed four times. What is the prob. of obtaining at least three heads?
in
Probability / Statistics
You probably should check the forum guidelines. Please show your work. You can't have nothing. Contemplate (a+b)^{4}
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2 replies | 126 view(s)
04-16-2018,
05:16 PM
tkhunny
replied to a thread
Definite integrals: If int[-2,6]f(x)dx=-6, int[2,6]f(x)dx=16, int[-2,6]g(x)dx=4, find
in
Calculus
And we are not working generally. We are solving the f(x) problem. Usually, I'm the one muddying the waters.
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5 replies | 131 view(s)
04-16-2018,
05:09 PM
tkhunny
replied to a thread
What is probability of pattern “number appears-none-appears” to happen in a lottery?
in
Probability / Statistics
If there is anything you can observe that makes it more predictable, the sponsors have failed miserably.
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1 replies | 66 view(s)
04-15-2018,
08:25 PM
tkhunny
replied to a thread
Please explain to me the "period" of a polar equation
in
Calculus
What is the period of \cos(2\theta)? What is the period of \cos(\theta)? Does this lead you to a guess?
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6 replies | 96 view(s)
04-15-2018,
07:39 PM
tkhunny
replied to a thread
Statistics: random sample of 35 Hollywood movies made since the year 2010...
in
Probability / Statistics
There are many who can help. This requires you to show us your best work. Go!
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1 replies | 66 view(s)
04-15-2018,
07:37 PM
tkhunny
replied to a thread
Definite integrals: If int[-2,6]f(x)dx=-6, int[2,6]f(x)dx=16, int[-2,6]g(x)dx=4, find
in
Calculus
Well, get better at it! You need this: For\;a < b < c,\;\int\limits_{a}^{c}f(x)\;dx = \int\limits_{a}^{b}f(x)\;dx + \int\limits_{b}^{c}f(x)\;dx ...
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5 replies | 131 view(s)
04-14-2018,
07:51 PM
tkhunny
replied to a thread
How would I prove an equation (x^2=4x+3) has no integral solution?
in
Intermediate/Advanced Algebra
Have a look at the "rational root theorem".
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3 replies | 154 view(s)
04-13-2018,
12:06 PM
tkhunny
replied to a poll
TI-84 plus help (factoring polynomials)
in
Calculator Questions
1) I'm guessing you have a value for x assigned. Find it and clear it. 2) What buttons did you push?
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17 replies | 173 view(s)
04-13-2018,
10:49 AM
tkhunny
replied to a thread
Can somebody help me w/ "7/10 of the boys in a marathon race were Chinese..."
in
Pre-Algebra
I always forget to look at that. Thanks, Doc.
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4 replies | 288 view(s)
04-13-2018,
10:44 AM
tkhunny
replied to a thread
alternating series: x - y/2 + x/3 - y/4 + x/5 - y/6 + ..., x,y > 0
in
Calculus
Have you considered rewriting each successive pair of terms? x - \dfrac{y}{2} = \dfrac{2x-y}{2} \dfrac{x}{3} - \dfrac{y}{4} = \dfrac{4x-3y}{12}...
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1 replies | 108 view(s)
04-12-2018,
08:37 PM
tkhunny
replied to a thread
Can somebody help me w/ "7/10 of the boys in a marathon race were Chinese..."
in
Pre-Algebra
Sure. I'll do about half of it. C = Number of Chinese Boys E = Number of Eurasian Boys M = Number of Malayan Boys Okay, you're almost done. ...
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4 replies | 288 view(s)
04-12-2018,
02:23 PM
tkhunny
replied to a thread
Paying taxes in "proportion" to our separate incomes
in
Finance/Business Math
You my wish to make the split proportional to Tax Liability, rather than income. You might be in a higher tax bracket. It wouldn't be fair to make...
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5 replies | 200 view(s)
04-12-2018,
02:19 PM
tkhunny
replied to a thread
I need your help for forecasting of salary: 40% of co-workers had 20% of night time.
in
Finance/Business Math
I do wish I could make sense of that. What do the other 60% do? What's "night time"? What logic is to be applied? Proportional to what? How...
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1 replies | 84 view(s)
04-12-2018,
10:32 AM
tkhunny
replied to a thread
Weighted probability: a machine will produce a sweet maximum 1 in 10 times
in
Probability / Statistics
?? It is not clear what is wanted. Every 10th one is a winner. This is clearly no random. This causes the problem you perceive. What's wrong...
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1 replies | 121 view(s)
04-11-2018,
05:28 PM
tkhunny
replied to a thread
Annuities & Perpetuities: X is thinking of acquiring a house to rent out indefinitely
in
Finance/Business Math
There is nothing here about the cost of the Real Estate. What is $72,000? Is that supposed to be the break even for a $3,600 annual perpetual...
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2 replies | 171 view(s)
04-11-2018,
02:57 PM
tkhunny
replied to a thread
Expected amount to pay for a life insurance policy
in
Probability / Statistics
We need a better question. 1) "He" would gladly pay $0 for such a policy. That's less than $365. 2) What is the least amount the insurance...
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1 replies | 46 view(s)
04-11-2018,
12:19 PM
tkhunny
replied to a thread
Present value Cash flow: one-time investment cost now of $360,000
in
Finance/Business Math
Could lead something. :-)
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5 replies | 156 view(s)
04-11-2018,
10:50 AM
tkhunny
replied to a thread
Explanation of this complex number multiplication interpretation.
in
Intermediate/Advanced Algebra
You may also wish to keep in mind that the Complex Number are not "Well-Ordered". What you think of as multiplication in the Real Numbers may not...
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2 replies | 88 view(s)
04-11-2018,
10:46 AM
tkhunny
replied to a thread
Understanding Why System of Equations is Degenerate
in
Intermediate/Advanced Algebra
Two things stick out: 1) As a linear system, at first glance, one may construe a1 and a2 as arbitrary parameters, rather than "unknowns". At this...
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4 replies | 183 view(s)
04-10-2018,
09:36 PM
tkhunny
replied to a thread
Simplify 6/(3-12i), find max/min of f(x)=x^2-10x+29, find range of f(x)=-2x^2-16x-38
in
Intermediate/Advanced Algebra
Couple of problems. 1) I can't see any of your work. 2) What's the difference between all the steps and the answer? 3) You appear to be...
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4 replies | 170 view(s)
04-10-2018,
02:50 PM
tkhunny
replied to a thread
I can't get system of eqns to come out right: 6x=5(x+y+3)-x, 3(x-y)+4y=5(y+x)
in
Intermediate/Advanced Algebra
Try that again.
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9 replies | 229 view(s)
04-10-2018,
02:46 PM
tkhunny
replied to a thread
Conditional probability? There is a bag with 10 marbles in it; 8 are black, 2 white
in
Probability / Statistics
Yes please specify with or without replacement. It is important with such a small population. Don't be afraid of it. The fact that p(50 black in...
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3 replies | 104 view(s)
04-10-2018,
09:16 AM
tkhunny
replied to a thread
Conditional probability? There is a bag with 10 marbles in it; 8 are black, 2 white
in
Probability / Statistics
Why not just build a tree? Round1 8/10 Black vs 2/10 White -- 20% chance that you will have only one draw. 80% chance that you continue. ...
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3 replies | 104 view(s)
04-10-2018,
09:10 AM
tkhunny
replied to a thread
Present value Cash flow: one-time investment cost now of $360,000
in
Finance/Business Math
You WILL have to set up a timeline and put all the cash flows on it. Make sure they all go the right direction.
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5 replies | 156 view(s)
04-10-2018,
09:08 AM
tkhunny
replied to a thread
Arithmetic sequences: sum of 1st n terms is 2 times sum of 1st 5 terms....
in
Intermediate/Advanced Algebra
You should have a formula for the sum of a number of terms of an arithmetic series. Please state it. How can you use it to solve this problem? ...
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2 replies | 110 view(s)
04-09-2018,
12:33 PM
tkhunny
replied to a thread
Algebraic Dot Products! Find a dot b if a=i-2j+3k, b=2j-3k
in
Calculus
Why does your Dot Product result in a Vector? You appear to be treating your 3-vectors like trinomials. "Purely Algebraic" doesn't mean anything....
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3 replies | 106 view(s)
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About tkhunny
Location:
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Occupation:
Actuary
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"Unique Answers Don't Care How You Find Them." - Many may have said it, but I hear it most from me.
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03:53 PM
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