Wednesday
July 23, 2014

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?

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?

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...

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

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

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?

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 bc...

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.

math
ln x^4 + ln X = 24 ln e. Find the value of x. ln x^5=24 x^5=e^24....next i dont know how to solve it. someone plz show me the calculation steps.

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 c...

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 Ser...

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.

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 Ser...

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

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 answe...

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...

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.

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

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.

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...

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 dont 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 weird an...

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, ho...

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....

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

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...

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

Math
I still dont 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 -8? i...

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-

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 thro...

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 didnt know how to proceed next bcus i didnt know how to find x to substitute in the f'(x).

Math
Thanks guy

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.

Math
Thanks steve

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.

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 ...

Math
At reiny .... Thanks

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?

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 wh...

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 didnt write the ans bcus the ans is quite long and d...

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