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)**

**DO THE WORK IN YOUR NOTEBOOK!**

#1, 4, 7, 14, 15, 17

**HAND-IN**

**pg 141 #18,24**

**Problem Set C #16**

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

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

DeleteYou 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.

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

DeleteTwas very helpful

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

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

ReplyDeleteGREAT 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.

DeleteHow would I solve problem 16?

Delete(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?

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?

DeleteI 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?

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!!

DeleteWhoops silly me!

DeleteFor problem 15 can I do number=number

ReplyDeletePercent. X

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

DeleteFor 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?

ReplyDelete