Thursday, December 10, 2015

Term 2: Weeks 2-3 Discussion

 Turn in #9 is due Friday, Dec.18, 2015!


This is for discussing assignments from WEEKS 2-3, including homework, turn-in #9, in-class work or lessons, or anything else related to the class from these weeks.  Please be sure to include your name at the end of your post for credit.  When answering a question, DO NOT GIVE SOLUTIONS! Provide hints or explain a method that you used, but do not give the final result.  As always, RESPECT IS A MUST! Anyone abusing this forum will be banned from future use (meaning, no extra credit!!!).
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10 comments:

  1. AnonymousDecember 16, 2015 at 10:52 PM

    For 3b on the turn in how I describe the region where f is concave up other than saying the second derivative has to be positive. Should I just make an equality with the second derivative greater than zero? And for 3d can I just plug in a point on the slope field that's on a line to get m and b?

    -Cara Young

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    1. Ari KDecember 17, 2015 at 5:21 PM

      For 3d I plugged in mx + b for y in dy/dx that we were given.

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    2. Coach WilsonDecember 17, 2015 at 8:14 PM

      When it says describe the region they want a verbal description. Look to the problems we did as HW and also in class earlier this week for example responses.

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  2. EvaDecember 17, 2015 at 1:51 PM

    Quick and probably easy question. Book work pg 312 #57, was it supposed to be page 314? Probably an annoying question but...

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    1. AnonymousDecember 17, 2015 at 2:43 PM

      I think that's how they are sometimes. Page 312 is where the section exercises start, but the problem we are doing is farther into the section (page 314).
      -Sarah Mostofizadeh

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  3. Zoe BowersDecember 17, 2015 at 7:04 PM

    I'm a little confused on 4b. Can anyone explain how they did that problem?

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    1. clairewesterlundDecember 17, 2015 at 8:14 PM

      I used the initial differential equation and substituted that in for the dy/dx and solved for y. I ended up getting a y= relationship that therefore encompasses all points. -Claire Westerlund

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  4. clairewesterlundDecember 17, 2015 at 8:15 PM

    I'm a bit confused on 3b. Are we supposed to be getting a relationship?

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    1. machomanschtuartDecember 17, 2015 at 11:12 PM

      This comment has been removed by the author.

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    2. AnonymousDecember 17, 2015 at 11:12 PM

      On 3b you derive for the second derivative of the function. It ALSO indirectly asks for an equation (or inequality) which can describe the region it asks for. The region is asks for is where the points are concave up, so we need to use the newly found second derivative equation to describe the region where all of the solutions are positive.
      -James Gruich

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