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by stapel_eliz
Tue Dec 16, 2008 12:32 pm
Forum: Advanced Algebra ("pre-calculus")
Topic: find the constant c that makes g continuous (g in two parts)
Replies: 1
Views: 6827

This would make the two ends meet up at (x, y) = (4, 12). Is that okay? I'm not forgetting any "calculus" stuff for this, am I? I'm not familiar with any extra, calc-specific stuff that you "should" do in addition to what you've done. And your value for "c" makes the t...
by stapel_eliz
Mon Dec 15, 2008 1:43 am
Forum: Calculus
Topic: find limit of (sin 4x) / (sin 6x) as x goes to zero
Replies: 2
Views: 8932

36: Find the limit: lim, x -> 0, (sin 4x)/(sin 6x) I'm pretty sure I need to use the fact that lim, x->0, (sin x)/(x) = 1.... You're exactly right about the tool you need to use. There's a bit of a trick to setting it up, though. For the moment, let's leave off the "limit" bit, and just d...
by stapel_eliz
Sun Dec 14, 2008 1:58 pm
Forum: Matrix (Linear) Algebra
Topic: formatting matrices using LaTeX and 'pre' tags
Replies: 0
Views: 2976

formatting matrices using LaTeX and 'pre' tags

LateX (pronounced "LAY-teck"): . . . . . [t ex]\left[ \begin{array} {rrr} 1&2&3 \\ 4&5&6 \\ 7&8&9 \end{array} \right][/tex] ...produces: . . . . . \left[ \begin{array} {rrr} 1&2&3 \\ 4&5&6 \\ 7&8&9 \end{array} \right] ...while: . . . . . [pre...
by stapel_eliz
Sun Dec 14, 2008 1:41 pm
Forum: Pre-Algebra
Topic: find normal and overtime rates of pay for carpenter
Replies: 3
Views: 5082

This answer works, but it seems too easy. Am I doing this wrong? You're only "doing it wrong" if you were told to use some particular other method (such as a system of equations). :wink: What you have done is logical, and it leads to the correct answer. I would think that, as long as you ...
by stapel_eliz
Wed Dec 10, 2008 7:35 pm
Forum: Forum Rules & Guides
Topic: trying out some of the formatting
Replies: 4
Views: 5091

It would appear that the "Pre" tags work better than the "code" tags...?

At least, I can certainly read the results better! :mrgreen:

by stapel_eliz
Wed Dec 10, 2008 6:27 pm
Forum: Discrete Math
Topic: find value of (x - a)(x - b)(x - c) ... (x - z)
Replies: 2
Views: 5516

They've given you the first three factors at the beginning, but only one at the end. Try writing out the factors from the end, working backwards from (x - z).... :wink:

by stapel_eliz
Wed Dec 10, 2008 12:36 am
Forum: Trigonometry
Topic: angle of depression and how tall is romeo
Replies: 1
Views: 4361

little_dragon wrote:Is this the right way to set it up? Do I do the trig ratios and use my calculator to find how tall he is?

Sounds good to me! :clap:

by stapel_eliz
Tue Dec 09, 2008 9:40 pm
Forum: Statistics
Topic: mean of 8 numbers is 3, mean of 12 is x, mean of all is 9
Replies: 2
Views: 4046

My thinking: Since the average of the 8 numbers is 3, and you find this average by dividing the total by 8, then that total is 8*3 = 24, right? So would the total of the others be 12*x, with the combined total being 20*9 = 180? And then you add the two smallers numbers and make this equal to the co...
by stapel_eliz
Mon Dec 08, 2008 6:29 pm
Forum: Beginning Algebra
Topic: Solve 2^(2x) - 7(2^x) - 8 = 0 (Hint: Let y = 2^x)
Replies: 1
Views: 3930

I think this gives me y^2 - 7y - 8 = 0. Is that right? That's exactly right! :wink: Now factor, and set each factor equal to zero. Once you've done that, plug the 2^x back in for the y, and use what you know about powers to find the answers. If you get stuck, please reply showing how far you got. T...
by stapel_eliz
Mon Dec 08, 2008 6:17 pm
Forum: Arithmetic
Topic: THINK + RETHINK = REFLECT (each letter stands for a number)
Replies: 2
Views: 4697

Am I doing this the right way? Is there a faster way of doing this? Thanks. You're doing this exactly the right way. No, I'm not familiar with any "faster" way. Just keep going like you are. You have found that T must be 2 or 4. Each of these options is a "case". So test the &qu...

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