# Posts by Ifi

Total # Posts: 39

**math**

Find the maximum and minimum of f(x; y) = 7x - 10y subject to the constraint x2 + 4y2 = 136. can someone tell me the final answer because my final answer has a lot of decimal point. Is it relevant?

*May 13, 2013*

**math**

Find the f''' of function f(x) = e2x6 + [lnx]2. Does we need to do by part? Can someone plz give me the final answer. I do this without using the by part formula..can it be correct?

*May 13, 2013*

**math**

The daily cost C, in RM, of producing a product is C(x)=1000+72x-0.06x^2 (0 more & equal x less & equal 60) where x represents the number of product produced. a) Find the daily cost of producing 50 units b) Find the marginal cost function. c) Find C’(50) and interpret its...

*May 5, 2013*

**math**

differentiate 3^(x^2). my ans is 3^(x^2) 2x ln 3. is it correct?

*May 3, 2013*

**math**

differentiate. y=2^(5x) my ans is y'=2^(5x)5 ln 2. is it correct?

*May 3, 2013*

**Math**

1. If -1/infinity = infinity or -infinity ? 2. If lim x->infinity^- = infinity & lim x->inifinity^+ = -infinity, then lim x->infinity = does not exist. Am i right? If im wrong please tell me the reason why?

*April 6, 2013*

**Math**

Given table, X (1+x)^(1/x) -0.5. 4 -0.1 2.8680 -0.01 2.7320 -0.001 2.7196 0.001 2.7169 0.01 2.7048 0.1 2.5937 0 5 2.25 From the table, show that lim x->infinity (1+x)^(1/x)=e. Plz someone show me the step how to show it based on the table. Hope u can read the given table ...

*April 6, 2013*

**Math**

Let log 2 = a, log 3 = b and log 7 = c. Express the indicated logarithm in terms of a, b, and c. 1-log3 5 (3 is the subscript of the log) ans:(1-a)/b, i need someone to show me the step bcus my ans is different from the given ans. my ans=(1/a)-b.

*March 28, 2013*

**math**

ln x^4 + ln X = 24 ln e. Find the value of x. ln x^5=24 x^5=e^24....next i don't know how to solve it. someone plz show me the calculation steps.

*March 25, 2013*

**account**

For both cases, show what each firm would report in its annual statement of profit and loss and other comprehensive income under the: a)Cash Basis b)Accrual Basis CASE 1 During 2012 Gangnam Marketing earned revenues of $500,000 on account. Gangnam collected $510,000 from the ...

*March 25, 2013*

**accounting**

I need to ask some opinion about this question. determine whether the description refers to solo proprietorship, partnership or corporation. 1. Jo Chen & Al Fitch own Financial services provider. Neither Chen nor Fitch has personal responsibility for the debts of Financial ...

*March 13, 2013*

**Accounting**

She deferred the current year depreciation of $49,000 to the following year in order to present in higher profit. My answer is the violation in conservatism bcuz she should calculate the current profit for every year.

*March 11, 2013*

**Account**

I need to ask some opinion about this question. determine whether the description refers to solo proprietorship, partnership or corporation. 1. Jo Chen & Al Fitch own Financial services provider. Neither Chen nor Fitch has personal responsibility for the debts of Financial ...

*March 11, 2013*

**math**

solve lim (5000t^2)/ (t+2)^2. the lim is t->infinity. can someone show me the calculation. the ans is 5000.

*December 29, 2012*

**math**

In a large vase, there are 8 roses, 5 daisies, 12 lilies and 9 orchids. If 3 flowers are selected at random, find the probability that at least 1 of the flowers is a lily. Assuming that the events are dependent. Would you consider this event likely to occur? Explain your ...

*December 28, 2012*

**math**

A school has 63 students studying Physics, Chemistry and Biology. 33 study Physics, 25 Chemistry and 26 Biology. 10 study Physics and Chemistry, 9 study Biology and Chemistry while 8 study both Physics and Biology. Equal numbers study all three subjects as those who learn none...

*December 24, 2012*

**math**

Find the area. y=x^2, y=x, x=1, x=-1. Ans=1. can someone show me the calculations because i got 1/3 unit^2.

*December 22, 2012*

**math**

Find the volume of the solid generated by revolving the curves y=x^2+1 & y=x+3. after finding the intersection, x= 2 & x=-1 can someone show me how to integrate this funct. with simplest steps(i mean do not use substitution formula). if im x miataken the ans is 117/5 pie unit^3

*December 21, 2012*

**math**

Finf the volume of the solid generated by revolving the region bounded by the curve. x=2/(y+1), x=0, y=0, y=3, about y-axis. My ans is pie unit^3. Is it correct? if wrong can i know the right calculation.

*December 20, 2012*

**math**

can someone show me how to solve this problem. It determines that in order to sell x smartphones, the price per product must be p=280-0.4x. It also determine that the total cost of producing x smartphones is given by C(x)=5000+0.6x. a. Find the total revenue, R(x). b. Find the...

*December 10, 2012*

**math**

use implicit differentiation to find dy/dx and then d^2y/dx^2. y^2=ye^x^2+2x ans for dy/dx= [2(xye^x^2 + 1)]/(2y-e^x^2) after that i don't know how to proceed. can someone show me the steps(x need for calculation) and final answer. i try to use wolfram but it give me a ...

*December 10, 2012*

**Math**

If f(x)=3x^2-5x, find the f'(2) & use it to find an equation of tangent line to the parabola y=3x^2-5x at the point (2,2). My ans is f'(2)=7 & y=7x-12. What is parabola exactly? & is the any possibility if the eqtn of f(x) is not the same with parabola eqtn? If yes, ...

*October 28, 2012*

**Math**

Differentiate ln (1+ cos x)... My ans is (-sin x)/ (1+cos x), but at wolfram is -tan (x/2). I think they simplify it but how did they do it? Sorry for my little knowlegde....

*October 28, 2012*

**Math**

Differentiate y=4^(3x^2).. i need to know the calculation step..thanks for the help....

*October 28, 2012*

**Math**

How to differentiate f(x)=e^(xlnx)? I get f'(x)=e^(xlnx) (1+lnx) while at wolfram is x^x(ln x+x)...sorry for my miscalculation / typo error...

*October 28, 2012*

**Math**

How to differentiate e^e^x? Ans at wolfram is e^(x+e^x). I need the calculation method.

*October 28, 2012*

**Math**

I still don't get it how do u simplify from = (8-2x)^2 (x^2+1)^4 (26x^2 - 80x + 6) to = -8(4-x)^2 (x^2+1)^4 (13x^2 - 40x + 3) ... ? What can i conclude from it is (4-x)^2 &(13x^2 - 40x + 3) is divided by 2 . Then (x^2+1)^4 is not simplified by any no. Lastly, why do u put...

*October 28, 2012*

**Math**

Differentiate f(x)= (8-2x)^3(x^2+1)^5. My ans is 2(8-2x)^2(x^2+1)^4(-3x^2-10x+37). Plz recheck my simplify ans. -my simplify ans is not the same as wolfram but the long ans is same with wolfram-

*October 28, 2012*

**Math**

Let f(x) be the parabola -x^2+16x-16. find the point (x,y) on f such that tangent line to f at (x,y) passes through the origin. My ans is (8,48). First i do f'x then i find x and lastly i find y. I do this because the max/min point is the point where tangent line pass ...

*October 28, 2012*

**Math**

find the intervals of increase and decrease of f(x)=3/(x*2+11) -1 ? My f'(x) is-6x/(x^2+1)^2, after that i didn't know how to proceed next bcus i didn't know how to find x to substitute in the f'(x).

*October 28, 2012*

**Math**

Thanks guy

*October 28, 2012*

**Math**

Calculate dy/dx, (x^3)(y^7) + 16xy^6=0 My ans is (y(-16-3x^2y))/ x(96+7x^2y) but at wolfram is y^6(3x^2y+16). Btw i use product rule to dy/dx. Need someone to recheck my ans.

*October 28, 2012*

**Math**

Thanks steve

*October 28, 2012*

**Math**

If f(1)=-2 & f'(x)_< 1.8 for 1_< x_< 8, what is the largest possible value of f(8)? Can someone help me on this question and plz provid me some calculation for this question.

*October 28, 2012*

**Math**

Let f(t)=2t^4-2x^2-9. at what x does f have a local or absolute minimum or maximum? I think the question is wrong bcus it is impossible to to have 2 unknown to find the relative max or min...right? Sorry if im wrong. So i change it to f(x)=2x^4-2x^2-9 so for relative max is x...

*October 28, 2012*

**Math**

At reiny .... Thanks

*October 27, 2012*

**Math**

dx/dy cos x sin y + x^5 = 11 i got dx/dy= (-cos x cos y)/ (-sin x sin y +5x^4) But the wolfram got (1- cos x cos y)/(5x^4-sin y sin x), where is the 1 come from?

*October 27, 2012*

**Math**

thanks for the calculation but i think there is a mistake at implicit diff. y^2= 9 + ((x-9)/6)^(1/5) 2y dy/dx = 1/5 ((x-9)/6)^(-4/5)) (1/6) dy/dx = 1/60y ((x-9)/6)^(-4/5) ..... Sorryif im wrong Btw why at wolfram the answer is 1/( 60y(-9+y^2)^4). Why is the x become y^2 and ...

*October 27, 2012*

**Math**

How to d/dx y= (9+((x-9)/6)^1/5)^1/2 ? Hope u can give me the way how to calculate it. ^^ I got 1/60 ((x-9)/6) ^ (-9/10), i think my answer is wrong because i check at wolfram website the ans is differrent from mine (sorry i didn't write the ans bcus the ans is quite long ...

*October 27, 2012*

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