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by DAiv
Wed Mar 11, 2009 8:03 pm
Forum: Pre-Algebra
Topic: Please explain why a 'negitive' plus a 'negitive' equals a p
Replies: 3
Views: 2522

Re: Please explain why a 'negitive' plus a 'negitive' equals a p

nicknation wrote:yeh its times not plus. sry


There are a number of ways to answer this listed here and here, so I'd suggest choosing the one that makes the most sense to you and rewriting it in your own words.


DAiv
by DAiv
Wed Mar 11, 2009 5:55 pm
Forum: Pre-Algebra
Topic: Please explain why a 'negitive' plus a 'negitive' equals a p
Replies: 3
Views: 2522

Re: Please explain why a 'negitive' plus a 'negitive' equals a p

Hi Nick, welcome to the forums. The simple answer is that it doesn't. I think there's been a mistake somewhere. A negative times a negative equals a positive . and A negative plus a negative equals a negative . Assuming there's been a transcription error, which of these should it have been? DAiv P.S...
by DAiv
Tue Mar 10, 2009 2:13 am
Forum: Beginning Algebra
Topic: explaining steepness in 3 sentences
Replies: 2
Views: 1630

Re: explaining steepness in 3 sentences

Suppose you wnated to show your students that it is precisely the coefficient of t in y=at +b that determines the "steepness" of its graph. In no more than three complete sentences, explain how you might go about showing this. Further to Eliz's reply, since we have three sentences to expl...
by DAiv
Fri Mar 06, 2009 7:22 pm
Forum: Intermediate Algebra
Topic: eqns for relationship between height H and femur length F
Replies: 2
Views: 2015

Re: eqns for relationship between height H and femur length F

idk

What does this part of your post mean?

I don't know.

Well, actually, I do. :wink:


DAiv
by DAiv
Thu Mar 05, 2009 2:04 am
Forum: Arithmetic
Topic: what is .65 2/3 in fraction form?
Replies: 3
Views: 3498

Re: what is .65 2/3 in fraction form?

its .65666666... We can break up the number into two parts: 0.65 \,+\, 0.00666666... and in fraction form, those parts become: \frac{65}{100} \,+\, \frac{0.666666...}{100} = \frac{65}{100} \,+\, \frac{\frac23}{100} Now, we need to get rid of the \frac23 , so we multiply both fractions by \frac33 , ...
by DAiv
Fri Feb 27, 2009 1:22 am
Forum: Intermediate Algebra
Topic: how to find real solutions to x^2 + 3x - 4 = 0
Replies: 2
Views: 14856

Re: x^2+3x-4=0

Hi Germo, welcome to the forums. :wave:

The lesson on Factoring Quadratics explains how to do this.


DAiv
by DAiv
Thu Feb 26, 2009 6:05 pm
Forum: Matrix (Linear) Algebra
Topic: what planting combination will produce the greatest revenue?
Replies: 2
Views: 2573

Re: what planting combination will produce the greatest revenue?

For my graph, I did O on the x axis and C on the y axis. When I graphed the lines, it looked like the line C = 60 - O/3 didn't actually make one of the sides of the shaded part. Did I do this wrong? Some restrictions may end up being superfluous. In this case, the line refers to the maximum amount ...
by DAiv
Wed Feb 25, 2009 2:40 pm
Forum: Intermediate Algebra
Topic: slope equation help
Replies: 4
Views: 2918

Re:

i am having problems with x1 not able or just don't see how to get the fraction at the end here is another problem y+3=3/4(x-2) then the problem begin when you dist the fraction 3/4 through to get 3/4x - 9/2 how to get the 9/2 is my prob. I find it easier to learn with examples to hand, so I'll lay...
by DAiv
Wed Feb 25, 2009 8:04 am
Forum: Intermediate Algebra
Topic: Quadratic formula help for 0.2xsquared + 4.5x - 2.8 = 0
Replies: 2
Views: 2135

Re: Quadratic formula help.

Hi, welcome to the forums. :wave: The Quadratic Forumula section explains how to solve awkward-looking quadratics. For \, 0.2x^2 \,+\, 4.5x \,-\, 2.8 , a = 0.2, b = 4.5, and c = -2.8 (note the minus sign). Just plug the values into the quadratic formula and away you go. If you get stuck, post your w...
by DAiv
Tue Feb 24, 2009 8:09 am
Forum: Intermediate Algebra
Topic: How to find the equation of a parabola?
Replies: 3
Views: 27555

Re: How to find the equation of a parabola?

Following your steps I found that: -1 = c and -a = -b What to do next? I was only given the two points: (0, -1) and (1, 1) and that the parabola is symmetrical around y-axis. Is it even possible? c = -1 is correct, but -a = -b isn't. I think you may have made a mistake when dealing with the sign of...

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