Elaine's Scribe Post

Hey everybody! In class, we went over what was due on Monday. They were:

-the exponent foldable 1 (this foldable is the one Mr. Backe handed to us. It had the list of the different laws. Here, we write an explanation of the laws, give examples of it, and on the back you write three BEDMAS questions and answer it.)

-the exponent foldable 2 (this is the foldable that we folded into thirds and then into fifths. Here, we write the definition, examples, and not examples of POWER, EXPONENT, BASE, COEFFICIENT, and EXPONENTIAL FORM.)

- the self -assessment of chapter 3

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Then, Mr. Backe wrote questions on the board for us to answer.They were:

Camille's Scribepost

Today in math class we had to find the answer to say for example 8²= 64 the answer is 4 because we look for the number that is in the ones place and also find the pattern. We also had to figure out some math problems.

examples:

Circle radius is 4 cm. How much of the square is not covered by the circle?

Formula: (2r)² -π r²

Answer:

(2r)² -π r²

(2•4)² -π 4²

8²-π 16

64-16.π

= 13.73 cm²

First do the bracket. r= 4. So 2 multiplied by 4 equals 8². then 4² = 16. 8² = 64. So 64 subtract by 16 multiplied by π. equals 13.73 cmπ

Side is 12 cm. How much of the square is not covered by the circle?

Formula: s² - π ( s/2) ²

Answer:

12²-π (12/2)²

12²-π 6²

144-π 36

= 30.90 cm²

S²=12². Then you do the brackets, so 12 divided by 2 all squared equals 6². 12² equals 144 and 6² equals 36. So 144- π x 36

We also learned what a coefficient is. It is the number you multpiy by. Like 4x, 4 is the coefficient and x is variable.

Oh remember to comment If I made any mistakes! Thank you!

by the way sorry for the layout. blogger isnt cooperating with me.

Jem's scribepost for november 19 2010

Oh Harro guys ! How was your weekend? Good okay. Anyways. . . As of last Wednesday to Friday we've been learning about "EXPONENTS". At the moment we should already know or have a better understanding on:

1. the different exponent laws
2. how to identify different exponents
3. how to solve different exponent type questions
   REMINDER: The pictures aren't in their best qualities so just click on the images to get a better view of the work I'm showing you guys! Thanks!
   

Our lesson on Friday focused on the three other laws that we didn't cover on Thursday so stay tuned because here i am to tell you what has been going on, on Thursday. IF YOU WEREN'T IN CLASS THEN YOU BETTER READ THIS! or else. . . i don't know. I better get this started so here we go.

Power of a Product Law-
When a product is raised to a power, you can rewrite the product by applying the exponent to each factor. Which means you use the same power for both numbers.
(a x b)² = a² x b²


Power of a Quotient Law-
When a quotient is raised to an exponent, you can rewrite each number in the quotient with the same exponent. Which means rewrite the the same quotient as many times as the power tells you too.
(a÷b)³ = a³÷b³
(a/b) ³ = a³/b³


Negative Exponent Law-
One is the numerator and the denominator is the positive exponent with the same base. (*Honestly I'm still kind of confused about how this law works so, if i do something wrong just tell me. And Mr.backe I need help!)
a¯¹ = 1/a¹
a-² = 1/a²


Okay, guys. . Thanks for spending your time to look at my blog post. Feel free to comment on how well/poorly my post was. Don't be afraid to make some suggestions on how I can make this blog more better. *DON'T FORGET TO DO YOUR HOMEWORK OR BACKE WILL BLOW IT :)*

• Stash it :All tests signed
  Self Evaluation
  Problem of The Week 3 and 4
  Foldable (divide/add/subtract/ multiply fractions and decimals), Different groups of Numbers
• Do your Journals
• Textbook and homework book questions
• Study all the time
• Comment at blogs
  Enjoy the 4 hours you have left of your week end. Okay okay ? Okay cool. Bye guys :)
  

CAMILLE CONCEPCION, your up next !

Seppe's scribe post for November 18th

Today in class, we moved to the next chapter. Mr. Backe taught us power and exponents.

A power is a quick way of writing repeated same number multiplication.

Base is the number used as a factor for repeated multiplication.
Exponent is the number of times you multiply the base in a power by itself.

22 = two squared = (lh) = 2x2
23 = two cubed = (lhw) = 2x2x2

You could also say -two to the exponent of 2 or 3
-two to the second/third power

Ordinality describes position. eg. 1st, 2nd, 3rd.....

Here are some examples of how you do it....

24= 2x2x2x2 = 16
23= 2x2x2 = 8
22= 2x2 = 4
21= 2 = 2
20= 1

34= 3x3x3x3 = 81
33= 3x3x3 = 27
32= 3x3 = 9
31= 3 = 3
30= 1

Laws

Zero Exponent Law- any base to the exponent of zero is 1. (X0=1)
Exponent Law of One- any base the exponent of 1 is itself. (X1=X)
Product Law- any powers with the same base when multiplied, add the exponents to get the new power. (73 x 75 = 78), (122 x 123 x 124 x 12=1210), or (am x an=am+n)

***Be careful when adding the exponents. Always remember that a number without an exponent (12) has a hidden one (1)

Quotient Law- when any powers with the same base are divided, subtract the exponents to get the new power. (44 / 42 = 42), (57 / 53 = 54), (am / an = am-n)

Power of a Power Law- when one (1) is raised to any exponent, it will always equal 1.

Power of a Power Law example...
14= 1x1x1x1 = 1
13= 1x1x1 = 1
12= 1x1 = 1
11= 1 = 1
10= 1

Here's a little video for you to watch :)

Question 12

12. In the table, a positive number shows how many hours the time location in ahead of the time in London, England. A negative number shows how many hours the time is behind the time in London.

*First of all: remember that in adding and subtracting fractions, you must find a common denominator first (if needed).

a) How many hours is the time in St. John's ahead of the time in Brandon?
To find the answer, I subtracted the amount of time in Brandon from the amount of
time in St. Johns. A diagram below shows you how I solved it, and therefore the time in St. John's is 2 and 1/2 hours ahead of the time in Brandon.

b) How many hours is the time in Victoria behind the time in Mumbai?
The process in the same as the last question, I subtracted the time in Victoria from the one in Mumbai. Below, it shows that time in Victoria is 13 and a half hours behind from that of Mumbai.

c) Determine and interpret the time difference between Tokyo and Kathmandu.
Once again, I subtracted the two times of both places. The diagram below shows that Tokyo is 3 and 1/4 hours ahead of Kathmandu.

d) Determine and interpret the time difference between Chatham Islands and St. John's.
I subtracted the amount of time in Chatham Islands to that of St. John's. The diagram below will show that Chatham Islands is 16 and 1/4 hours ahead.

e) In which location is the time exactly halfway between the times in Istanbul and Alice Springs?
The time in Kathmandu, Nepal is halfway between times in the other two locations. How did I know that? Because I added the times in Istanbul and Alice Springs (refer to chart above) and then I divided their sum by 2 because we are finding the halfway point. (Half= 2)

Thank you for reading :)

Seppe's scribepost

Question 18, 2.4 on page 79

18. A frame measures 30 cm by 20 cm. Can you mount a square picture with an area of 500 squared cm in the frame? Explain.

Frame
= 30 x 20

Picture
= 500

So to find the sides of the picture, you have to find the square root of 500 which is 22.36.
One side of the picture is too big for the frame so the answer is no, it can't fit in the frame.

PLEASE COMMENT (IF YOU WANT) TO MAKE MY POST A BETTER ONE :D

Connor's Post for November 9th Question 13

In math class we were all assigned questions and mine was question 13 in section 2.3.

13. The diameter of Pluto is 6/17 the diameter of Mars. Mars is 17/300 the diameter of Saturn.

A) What fraction of the diameter of Saturn is the diameter of Pluto.

Since Pluto is 6/17 of Mars and Mars is 17/300 of Saturn you need to cancel out the 17.
You are left with 6/300 and that is 0.02.
0.02 x 50 = 1
1/50 is the final answer.

B) The diameter of Saturn is 120 000 km. What is the diameter of Pluto?

1/50 = 0.02
120000 x 0.02 = 2400
The diameter of Pluto is 2400km.