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by anonmeans
Fri May 15, 2015 8:41 pm
Forum: Intermediate Algebra
Topic: Simplify the following expression...how?
Replies: 3
Views: 60

Re: Simplify the following expression...how?

Simplify the following expression. Write the answer with positive exponents and assume the variable represents a nonreal number. - 1/9 w^-8 times (-36w^-3) I don't see why you're supposed to "assume the variable represents a [complex or imaginary] number"...? Before the "times",...
by anonmeans
Fri May 15, 2015 7:02 pm
Forum: Intermediate Algebra
Topic: linear programming question - Problem with Constrain
Replies: 2
Views: 48

Re: linear programming question - Problem with Constrain

I'm sorry but I don't understand what you're trying to do. What is the EXACT text of the exercise? What are the EXACT parameters? How are the constraints defined? What do you mean by "submitting as two scores"?

Thanks.
by anonmeans
Thu Apr 30, 2015 4:03 pm
Forum: Calculus
Topic: integral cos (Pi * x)
Replies: 1
Views: 105

Re: integral cos (Pi * x)

can anyone help me with the intigral of (pi * x) Since \,\pi\, is just a number, the integral of \,\pi\,x\, works just like the integral of any other product of \,x\, and a number: \int\, ax\, dx\, =\, a\, \left(\dfrac{x^2}{2}\right) In your subject line, you also ask about the integral of ...
by anonmeans
Sat Feb 14, 2015 3:38 pm
Forum: Calculus
Topic: Given z=x²+3xy-2y²
Replies: 2
Views: 335

Re: Given z=x²+3xy-2y²

Given z=x²+3xy-2y² Estimate the change in z when x changes from 2 to 2,5 and y changes from 3 to 2,5 What method are you supposed to use to do the estimation? Did they give you any formulas, like partial-dz = (partial-dz/partial-dy)dy + (partial-dz/partial-dx)dx? Or maybe something like is in this ...
by anonmeans
Sat Jan 24, 2015 4:03 am
Forum: Calculus
Topic: Help needed to evaluate limits
Replies: 5
Views: 781

Re: Help needed to evaluate limits

Do you know how to read? Yes, I do. Do you? I showed you all the steps and explained that the result means that the limit of negative 2 times negative numbers, as those numbers get really, really far negative, is positive infinity, so the limit is "+infty". Why do you think showing your w...
by anonmeans
Fri Jan 23, 2015 8:07 pm
Forum: Calculus
Topic: Help needed to evaluate limits
Replies: 5
Views: 781

Re: Help needed to evaluate limits

Anonmeans, thank you, but can you please answer my question? I gave you all the steps. I showed you the limit expression is -2x. I pointed out that x < 0. Algebra says x < 0 means -2x > 0 so, when you take the limit, the value has to be positive. What part do you still need answered for you? :confu...
by anonmeans
Fri Jan 23, 2015 5:06 pm
Forum: Calculus
Topic: Help needed to evaluate limits
Replies: 5
Views: 781

Re: Help needed to evaluate limits

I have no idea how to solve it. Update! I just did this question: a) 3.5 B) infinity, but I am not sure why positive infinity??? Can someone explain it to me, please? The answers are right, I just need to find out why... How did you "do" these if you don't know how they're done? :confused...
by anonmeans
Fri Jan 02, 2015 5:19 am
Forum: Trigonometry
Topic: trig identities
Replies: 2
Views: 522

Re: trig identities

I'm having difficulty solving the following (giving answers in degrees between -180 and 180): cos2(@) = sin(@)cos(@) The 2 is inside the cos, right? There's probably loads of ways to do this. One is to do the RHS as 2*(1/2)*sin(@)*cos(@) = (1/2)[2 sin(@) cos(@)] = (1/2) sin(2@). Then cross-multiply...
by anonmeans
Mon Dec 22, 2014 5:46 pm
Forum: Trigonometry
Topic: solving trigonometric eqn: 16sin^2theta = 3 / (cos^2theta)
Replies: 3
Views: 692

Re: solving trigonometric eqn: 16sin^2theta = 3 / (cos^2thet

I'll use "@" for "theta". Solve the following equation for theta: 16sin^2theta = 3 / (cos^2theta) I'd cross-multiply: 16sin^2(@)cos^2(@) = 3 Then use a trig ident: 2sin(@)cos(@) = sin(2@) 16sin^2(@)cos^2(@) = 4(4sin^2(@)cos^2(@)) = 4[(2sin(@)cos(@))^2] = 4sin^2(2@) Then: 4sin^2(2...
by anonmeans
Wed Dec 17, 2014 1:24 am
Forum: Geometry
Topic: Triangle Questions
Replies: 4
Views: 6149

Re: Triangle Questions

studentin wrote:Hi everyone i have two geometry questions can you please help me?

I can see part of one picture. What are the "two geometry questions"???

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