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by FWT
Mon Aug 22, 2016 8:58 pm
Forum: Geometry
Topic: circle problem
Replies: 1
Views: 241

Re: circle problem

If two circles intersect at two points, prove that their centres lie on the perpendicular bisector of the common chord. Please help me. What have you tried? You drew the circles; labeled the chord's endpoints (say, A and B), the circles' centers (say, P and Q); drew the segments AB and PQ; and labe...
by FWT
Tue Aug 02, 2016 5:38 pm
Forum: Arithmetic
Topic: population of bacteria doubles in two hours
Replies: 2
Views: 496

Re: opulation of bacteria doubles in two hours

Hi, my son is going to six grades this year... "Generation time is the time it takes for a population of bacteria to double in number. If you begin with one X bacteria and one Y bacteria, what is the difference between the numbers of X bacteria and the number of Y bacteria produced in two hour...
by FWT
Wed Jun 01, 2016 9:03 pm
Forum: Beginning Algebra
Topic: Cancelling factors with multiplication problem
Replies: 1
Views: 331

Re: Cancelling factors with multiplication problem

I'm having a little trouble understanding why I can't factor certain groups in this equation: Original eq.: x^2+2xy+y^2/x^2-2xy+y^2 multiplied by (x-y)/5x+5y What you've posted means this \left(x^2\, +\, 2xy\, +\, \dfrac{y^2}{x^2}\, -\, 2xy\, +\, y^2\right)\, \times\, \left(\dfrac{x\, -...
by FWT
Thu May 12, 2016 5:31 pm
Forum: Calculus
Topic: How would you solve x^2*e^x/x^2+e^x ? (* symbolizing multipication)
Replies: 2
Views: 538

Re: How would you solve x^2*e^x/x^2+e^x ? (* symbolizing multipication)

I got the answer x*e^x(x+2e^x)/2x+e^x , but the answer my textbook gives is x*e^x(x^3+2e^x)/(x^2+e^x)^2. I don't understand why there is an x^3 in the parenthesis nor why the bottom section is squared. What do you mean by "solving" the expression? (Only equations can be solved. Expression...
by FWT
Thu May 12, 2016 5:28 pm
Forum: Beginning Algebra
Topic: linear equations
Replies: 1
Views: 358

Re: linear equations

Good morning, I am having trouble grasping the concept of how to setup linear equations. I could really use some help with the following problem: At a football game, dad purchases hot dogs for $1.25 and drinks for $1.75. If he purchases 9 items for $13.25, how many of each did he purchase? This is ...
by FWT
Fri Apr 08, 2016 1:25 pm
Forum: Calculus
Topic: Optimization problem is giving me ALOT of trouble.
Replies: 1
Views: 511

Re: Optimization problem is giving me ALOT of trouble.

2. A shed will have square ends and a sloped roof. Did they maybe have a picture with this? Because if two sides are square, then they can't have a sloped roof over them. The sides would have to have triangles of some kind above any squares. When you write back, please show what you did so far, lik...
by FWT
Sat Apr 02, 2016 12:07 am
Forum: Advanced Algebra ("pre-calculus")
Topic: solving for x given: 4e^-.2x + 3e^-.3x = 5
Replies: 4
Views: 446

Re: solving for x given: 4e^-.2x + 3e^-.3x = 5

b-thanks and the 5 should be .5 So you meant this: \mbox{Solve }\, 4e^{-0.2x}\, +\, 3e^{-0.3x}\, =\, 0.5 Try using the steps, etc, explained in your other thread . The equations are pretty much the same so the methods will be pretty much the same too. If you get stuck, please write back showing wha...
by FWT
Sat Apr 02, 2016 12:05 am
Forum: Advanced Algebra ("pre-calculus")
Topic: solving for x, given exponentials: 4e^2x + 5e^3x = 15
Replies: 7
Views: 870

Re: solving for x, given exponentials: 4e^2x + 5e^3x = 15

I meant b So you meant this: \mbox{Solve }\, 4e^{2x}\, +\, 5e^{3x}\, =\, 15\, \mbox{ for the value of }\, x. and in order to solve say e^(2x) = Y I would take log of both sides so- Taking logs of both sides would give you this: \ln\left(\,4e^{2x}\, +\, 5e^{3x}\,\right) =\, \ln(15) Y...
by FWT
Fri Mar 18, 2016 3:15 pm
Forum: Calculus
Topic: u substitutions
Replies: 3
Views: 479

Re: u substitutions

wiloben25 wrote:i understand that u=t^2 gives rise to du = 2t dt however i can't wrap my head around how this integrates into the orginal through substituition.

Use the next step that I gave you. The numerator is t^5 dt = (t^2 t^2 t) dt = (t^2)^2 (t dt) = ... and so forth.
by FWT
Fri Mar 18, 2016 3:14 pm
Forum: Arithmetic
Topic: Calculating An Equation
Replies: 1
Views: 435

Re: Calculating An Equation

For homework, I have been given four points and I want to figure out the equation for them. The points are: (1,4) (2,8) (3,16) (4,32) The point is that the equation doesn't match all of the given points. What is your equation? How did you get it? Please reply as soon as possible by this evening. Li...

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