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by buddy
Wed Jun 24, 2015 9:36 pm
Forum: Geometry
Topic: Need help with a sphere
Replies: 1
Views: 76

Re: Need help with a sphere

I have created a circle with points; this wasn't that hard. Now, I want to create a sphere using points. I'm not really sure what you're doing, but maybe spherical coordinated might help ( here ). You know the center and radius from the circle. Can you plug these into spherical coordinates to get t...
by buddy
Wed Jun 10, 2015 12:37 am
Forum: Advanced Algebra ("pre-calculus")
Topic: How to write an equation for an ellipse using height and width
Replies: 4
Views: 139

Re: How to write an equation for an ellipse using height and width

If you look at the second problem and answer then I would think that a = 1/3 and b=1/4 and my answer would be the reverse of the answer given You're actually right and the answer they gave you is wrong. You can check by graphing. Look at the graph of their equation: https://www.wolframalpha.com/inp...
by buddy
Mon Jun 08, 2015 4:27 pm
Forum: Beginning Algebra
Topic: Can't get fraction out of an equation
Replies: 2
Views: 119

Re: Can't get fraction out of an equation

At the link is this: Find equation of line. Write in f(x) Through (-5, -7); paralells [sic] 6x + 5y = 11 a) find slope 6x + 5y = 11 -6x . . . . . -6x 5y = 11 - 6x y = (11 - 6x)/5 y = 11/5 - (6/5)x b) y - y1 = m(x - x1) y - -7 = -(6/5)(x - -5) y + 7 = -(6/5)(x + 5) 5(y + 7) = 5*(-6/5)(x + 5) 5y + 35 ...
by buddy
Mon Jun 08, 2015 4:17 pm
Forum: Advanced Algebra ("pre-calculus")
Topic: How to write an equation for an ellipse using height and width
Replies: 4
Views: 139

Re: How to write an equation for an ellipse using height and width

Yes (if you're saying that your a^2 is bigger than your b^2). It's like they show here.
by buddy
Mon Jun 08, 2015 4:15 pm
Forum: Advanced Algebra ("pre-calculus")
Topic: How to find the center and radius of a circle with a large term
Replies: 3
Views: 129

Re: How to find the center and radius of a circle with a large term

mathpatient wrote:How can I find the center and radius of a circle given this equation:

x^2 + 4x + y^2 + 4y + (71/4)

This isn't an equation b/c there isn't an "=" in it. W/o that, you can't get the center or radius.
by buddy
Wed Jun 03, 2015 9:54 pm
Forum: Intermediate Algebra
Topic: Rational Expression Multiplication
Replies: 1
Views: 102

Re: Rational Expression Multiplication

I have worked and reworked the multiplication below, but can't get the correct answer. What did you do? What did you get? \left(\dfrac{ab-a+3b-3}{ab+a+4b-4}\right)\times \left(\dfrac{ab+2a-4b-8}{ab+2a+3b-6}\right) Do factoring in pairs. They show how here . ab - a + 3b - 3 = (ab - a...
by buddy
Fri May 29, 2015 11:19 am
Forum: Advanced Algebra ("pre-calculus")
Topic: vector to polar coordinates....help!
Replies: 1
Views: 157

Re: vector to polar coordinates....help!

1) Given a vector L= 47 -j 33 I don't understand the "vectors" you're using. Why is "33" after the unit vector j instead of before? Or is "33" supposed to be an exponent of some kind? What vector is supposed to go with the "47"? What have you tried so far? Se...
by buddy
Fri May 29, 2015 11:14 am
Forum: Discrete Math
Topic: Another way to write the XOR Operator.
Replies: 1
Views: 122

Re: Another way to write the XOR Operator.

Does anyone know what is the equivalence of the XOR operator if you were to do this p XOR q ? I have to do draw the circuit diagram for that expression without using the XOR gate. Basically what I'm asking is what logical connectives would be the equivalent of writing p XOR q in terms of ~ ^ and v?...
by buddy
Fri May 29, 2015 11:10 am
Forum: Beginning Algebra
Topic: Surveying mathematics: Vectors and Areas
Replies: 3
Views: 138

Re: Surveying mathematics: Vectors and Areas

patchy1 wrote:It's more just vectors and areas isn't it?

I don't know what you're supposed to do with the plat map, or what things like "ones of minutes" mean, so I don't know what's required. Sorry. You'd need to explain all the geocaching stuff.
by buddy
Fri May 22, 2015 4:12 pm
Forum: Calculus
Topic: Is it possible to evaluate this integral without a calculator?
Replies: 3
Views: 170

Re: Is it possible to evaluate this integral without a calculator?

stapel_eliz wrote:
CollinR wrote:What I am wondering is if it is even possible to evaluate this integral without a calculator.

The result, from Wolfram Alpha, seems fairly unwieldy.
CollinR wrote:After this, I can just use integration by parts, correct?

After what? The answer from Wolfram?

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