Saturday, October 22, 2016

hw #2-9 & #2-10 Percent means Per 100

hw #2-9
Set up a proportion and solve
ALSO set up a "proportion bar" as we did in class
pg 141 #9, 13, 17, 21, 25 

hw #2-10
pg 148 #1, 2, 7-17 ODD

hw #2-R1 Chapter 2 Problem Set C
(attached as a photo, if you would like a paper copy, please stop by on Monday morning)
#1, 4, 7, 14, 15, 17

pg 141 #18,24
Problem Set C #16


  1. FortuneFavorsThePreparedOctober 22, 2016 at 3:27 PM

    I need help on problem 1 on pg 148 where it asks what is the percent decrease between 6 min 13s and 6 min 5s

    1. Great Question!! I'm sure many others are very glad that you asked.

      You really need to convert to a single UOM (unit of measure).

      The general measure is time... what would give you an integer value to work with? Hours? Minutes? or Seconds?

      I would choose integers over mixed numbers or fractional values anytime, right?

      The original time is 6 minutes and 13 secs, right? So that is the WHOLE amount.

      Instead of 6 mins and 13 secs, try using 373 secs.
      Draw the percent bar from 0 to 100%.
      Label the UNITS side of the bar from 0 to 373 secs.

      Where would 365 secs (6 mins 5secs) go?

      Look at the sample problems we did.

      LMK if this helped.

    2. This was very helpful Mr. C. Also, there are two 2-9 and 2-10 blogs.

    3. Twas very helpful

  2. You should be using the percent/proportion bar for homework, too.

  3. For problem 16 on problem set C ( convert 18 miles/hr into feet/sec), how would you do a check for your answer?

    1. GREAT QUESTION... It's kind of tough to easily do a check on a problem like this... you would actually have to convert it back from feet/sec to miles/hr. I will not make you do this for our tests/quizzes, HOWEVER, when you are building bridges and sendin rockets into space, this kind of reverse cross-checking would be required.

    2. How would I solve problem 16?
      (on problem set C; convert 18 mi/hr into ft/sec)
      Would I treat it like a conversion problem or like a percent increase/decrease?

    3. How would you describe what you are doing. Are you converting the expression in to a different UOM or are you finding a percentage or proportion?

      I would think that since the work "Convert" is part of the problem, that might be a hint, eh?

      Did you check your notes? Look at a video? Read the text book?

    4. I'll betcha even if you just READ the titles of the sections in the text book (2-6 thru 2-10) that would help you!!

  4. Whoever I want to beOctober 25, 2016 at 8:16 PM

    For problem 15 can I do number=number
    Percent. X

    1. I'm not answering questions where you don't specify the problem...

  5. For problem 13 on page 141, what % of 48 is 20, I used a proportion to solve the problem. My answer was 41.7 (I rounded up from 41.66 repeating). How would I solve that with a fraction bar?