Krystal`s Scribe for November 9th 2010.

SUUUP. I got picked to do the scribe today :)

In class, we basically just took notes about "Things You Need To Know". Here are the notes.

Signs,signs,everywhere. Signs....
-In mathematics we follow a certain order to be able to get the same answer. Order is usually devoted by certain symbols that help us get to the same answer all over the world. BEDMAS.
B=brackets= [ ] , { }, ( ).
E=exponents
D=division (multiplication)
M=multiplication (division)
A=addition (subtraction)
S=Subtraction (addition)

Sometimes it`s PEDMAS. P= Paranthesis.

-3.6-2.8-2=
-3.6-(2.8-2.1)=4.3 <---BEDMAS Other Confusing Signs: -When brackets kiss. () ( ), it means to multiply. -A bracket around an integer or any rational number does not necessarily mean, "do me first"
(-3)=6.7=
6x7 6.7. A dot between numbers can also mean multiplication or a decimal, it depends on the dots position.
6.7=multiply 6.7=decimal <--Fail, sorry I didn`t know how to do the thing.

When is a Negative Number, Negative ?


12-(-4/5)=17 4/5
6-[-(-3/-4)]= 6 4/3 = 7 1/3
12(-4/-5)=11 1/5

1=(-1)(-1)(-1)(-1)
-1=(-1)(-1)(-1)(-1)(-1)

All or Some ?
2.3 squared = 36 or 18 ? Answer:18 = 2.(3.3) 9.2=18

(2.3)squared = 6 squared = 6.6= 36
-1/4 + (2/3)= ).43 < decimals or fractions ?

FOR HOMEWORK MAKE SURE YOU FINISH 2.3 AND 2.4 FOR MONDAY !!!!!

next i pick... uhh Faye I guess.

John's Scribe Post For November 4th, 2010

Hey guys

Last class Mr.Backe assigned me question 24 in section 2.1 page 58.

Question: Give an example of a fraction in lowest terms that satisfies the following conditions.

A) Greater then 0, with the denominator greater than the numerator.

Answers: 1/3 or 2/5

B) Between 0 and -1, with the denominator less then the numerator.

Answer: for this answer I had a really hard time with so I looked at the back of the book. 3/-4

C) Less than -2, with the numerator less than the denominator.

Answer: -8/4

D) Between -1.2 and -1.3, with the numerator than the denominator.

Answer: 4/-3.

If anyone can explain question B it would help and if I got anything wrong tell me.

-JOHN!

Raquel's Scribepost for November 4th

QUESTION #17 FOR 2.2

• TWO wooden poles measured 1.35m and 0.83m in length. To make a new pole they were attached by overlapping the ends and trying them together. The length of the overlap was 12cm. What was the total length of the new pole in meters.

- For this question all I really did was add 1.35m and 0.83m and subtracted the results with 12cm.



Yeah, that's mostly it. Sorry, I didn't get enough time to take some pictures.

Karra's Scribe Post for November 4, 2010

2.2 - Text Book
Question: #16

Bella is more comfortable working with integers than with positive and negative decimal numbers. This is her way of understanding -4.3 + 2.5 .

-4.3 is -43/10 or -43 tenths

2.5 is 25/10 or 25 tenths

-43 tenths + 25 tenths is -18 tenths

-18 tenths is -18/10 or -1.8

So, -4.3 + 2.5 = 1.8

A ) Use Bella's method to determine 6.1 + (-3.9).

B) How could you modify Bella's method to determine 1.25 -3.46?

This is how you do the practise 2.2 question 14 in the textbook.

The question:Saida owns 125 shares of an oil company. One day, the value of each share dropped by 31 cents. The next day the value of each share rose by 18 cents. What was the cahnge in the value of Saida's shares?

The solution : Lets say each share is a dollar. now it drops by 31 cents. Its value is now 69 cents. Now we add 18 cents. We have 87 cents. Then we have to figure out what the value change would be now for one share. A share has dropped by 13 cents. Times 13 by 125, or you can do it a simpler way by times by 5 first to get 65 cents . Times by 5 again to get $3.25. Times by 5 one more time to get the final answer $16.25.
The Answer :The total value change of Saida's shares altogether dropped by $16.25.

Ezekiel's Scribe post for November 4, 2010

Question #22
An aircraft was flying at an altitude of 1950m. It descended for 3 min at 2.5 m/s and then descended for 2.5 min at 2.8 m/s. What was the plane's altitude after the descent?

The plane is descending for 3 minutes at 2.5 m/s

1 minute has 60 seconds so 60 x 3 = 180

Then you multiply 180 by 2.5

180 x 2.5 = 450

now u can subtract 2950 by 450

2950 - 450 = 2500 m

now the plane is descending down for 2.5 minutes at 2.8 m/s

multiply the 60 seconds by the minutes going down
60 x 2.5 = 150

now times the seconds by the m/s which is 2.8

150 x 2.8 = 420

now subtract 420 by 2500

2500 - 420 = 2080 m
The altitude of the plane after the descend is 2080 m

Harvey's Scribepost for November 4, 2011

2.2 Apply, Question 21, page 61

Andrew drove his car 234 km from Dawson to Mayo in Yukon Territory in 3 h. Brian drove his truck along the same route at an average speed of 5km/h greater than Andrew's average speed. How much less time did Brian take, to the nearest minute?

If we divide 234km by 3h, we should get the km. We need to get Andrew's average speed because we need it to find out how long Brian took to reach the same distance.

78=234/3

So Andrew drove his truck at 78km/h.

We know that Brian drove 5km/h faster than Andrew, so he would have driven at 83km/h.

To find out how long he drove, we divide 234km by 83km.
2.819277108=234/83

Round.
2.8=234/3

Brian drove at 83km and took 2.8 hours.

We need to know how much more faster Brian was compared to Andrew. To do that, we convert the hours into minutes. To do this, multiply the hours by 60 minutes.

Andrew:
180=60*3

Brian:
168=60*2.8

Then subtract, and we have our answer.
12=180-168

Brian was 12 minutes faster than Andrew to reach the same distance.

Kathleen's Scribepost for November 4, 2010

2.2

Question #12

A pelican dives vertically from a height of 3.8 m above the water. It then catches a fish 2.3 m underwater.

a) Write an expression using rational numbers to represent the length of the pelican's dive.

b) How long is the pelican's dive?

a) Answer will be a rational number or integer cause the question asked to write an expression using rational number.

3.8 - (-2.3)

3.8 is positive because it's above water and -2.3 is negative because the pelican went underwater.....like descending.

The answer is a positive because the subtrahend is much bigger than the minuend.

b) The pelican's dive is about 6.1 meters long.

Kenneth's Scribepost for November 4, 2010

Mr.Backe Assigned to me #19 pg53 of 2.1 fo

r scribe so yea I got the easy one.

Anyways I'm going to show you the answers for #19 (For those who either did or didn't do their homework) as well as the questions I'm about to show you.

Comparing and Ordering Rational Numbers

19. The table includes the melting points and boiling points of six elements known as the noble gases.

a)Which noble gases have a melting point that is less than the melting point of argon?

Whats less than the melting point of argon

is Helium and Neon

b)Which noble gases have a boiling point that is greater than the boiling point of krypton?

What's greater than the boiling point of krypton is Radan and Xenon

c) Arrange the melting points in ascending order.

-272.2, -248.67, -189.2, -156.6, -111.9, -71.0

d)Arrange the boiling points in descending order.

-61.8, -107.1, -152.3, -185.7, -245.92, -268.6

If I got any Errors Please Correct me by commenting xD and sorry for not putting coloring in because it wont let me -_- and yea I don't know how to make my picture big

Celdrick's Scribepost For November 1, 2010

CONVERTING DECIMALS TO FRACTION



Converting decimals into fractions is really simple.
Just follow my steps....

Let's try converting this number to fractions.
0.8 repeating.

0.8 can be shown as what ever you like. But I'll use x.

x=0.8 repeating.

Step 1.
Convert the decimal into a whole number and multiply it by ten because it's in the tenth place.


Step 2.
Subtract the 8.8 to the 0.8.

Step 3: Get rid of the decimal.
To do that you need to divide 9x to 9.

Step 4. Put the 9 below the 8.

Step 5. Try to convert it into a smaller fraction.












Now lets try to convert this decimal number to a fraction.


X=0.08 repeating.

Step 1.
Convert the decimal into a whole number and multiply it by one hundred because it's in the hundredth's place.


Step 2.
Subtract 8.88 repeating to 0.08

Step 3.

Get rid of the decimal.
To do that you need to divide 99 x to 99 and whatever you do to one side you do it to 8.8 too.

Step 4. Convert it into a whole number
8.8 x 10
99 x10

Step 5.

x= 88 over 990...CONVERT!!! 8 over 90 is the answer. So..... x=8 over 90.






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