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Preview: 841 Math (2007)

841 Math (2007)

Updated: 2014-10-04T21:43:27.450-07:00


Anthony D'S SCRIBE


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Marlon's Scribe Post


1. Ms. Enigma said, " Five less than one third of my age is 14." How old is Ms. Enigma?Ms. Enigma is_____. x/3 x/3 -5=14 let x= Ms. Enigma's age. +5 +5 Substitute to check... x/3=19 x/3 -5=14 x3 x3 57/3 -5=14 x=57 19-5=14 14=14 Ms. Enigma is 57.2. Suppose you have $50 and earn $8 per hour. How many hours must you work until you have $170?I must work_____.[...]

Mary's Scribe Post


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Kat's Scribe


May 13, 2008

Today in class, we were given a worksheet for homework. On one side, there are eight geometry questions. Here are the first four of these questions:

1. The length of a rectangle is 3 times the width. The perimeter id 96cm. Find the width and length.

2. The length of a rectangle is 5m greater than the width. The perimeter is 150m. Find the width and length.

3. The width of a rectangle is 12 cm less than the length. The perimeter is 156cm. Find the width and length.

4. The length of a rectangle is 2cm less than 7 times the width. The perimeter is 60cm. Find the width and length.


Before you attempt to solve these questions, take a look at the slide show beneath. It tells you 7 Steps to Solving the questions. It should make solving easier for you.

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And now back to the questions.

1. The length of a rectangle is 3 times the width. The perimeter id 96cm. Find the width and length.


2. The length of a rectangle is 5m greater than the width. The perimeter is 150m. Find the width and length.


3. The width of a rectangle is 12 cm less than the length. The perimeter is 156cm. Find the width and length.


4. The length of a rectangle is 2cm less than 7 times the width. The perimeter is 60cm. Find the width and length.


Kate's Scribe : The E-True Hollywood Story


The E-True Hollywood Story...
Negative X

Jessica Q's Scribe Post


Jessica Q's Scribe Post:

Like Terms
The Distributive Property

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Charity's Scribe


For question 4 I got it wrong because I was supposed to put decreased and not less than.
For question 6 I got it wrong because I was supposed to put the 7 infront of 4x
So as you can see I would have gotten it right if only I wrote them opposite from each other.

(image) I got write the algebriac expression or equation for the pattern you notice wrong because I rushed and The answer on the very right lower corner isn't even understandable.

My T-Chart has the (x) axis on the left and the (y) axis on the right because that is the order it has to be in.

Jeanine's Scribe.


So, this is my scribe for the Patterns and Relations Investigation Answer sheets.

(object) (embed)

Chaseley's Scribe


Car Repairs

when you draw a t-table you have to make sure x is on the right if you are doing it from top to bottom. When it is laying down make sure the x is on the bottom.

When I said add one to figure number i meant to add one to x ( 1 + 1) . Then add 2 to y (1 + 2 = 3)

The algebraic expression I found was 2x - 1 =y.

Then I drew a chart to explain my answers.
When you draw a chart make sure you have your labels or you'll lose marks. When you number your chart always check if you marked it right on the line, not in the center. For "y" make sure you don't go up by 1,3,5,7,9,11. go up by 2's 3's 4's 5's or which ever way fits best. In this chart going up by 2's are the best.

Dhonell's Scribe Post


Today we learned about Algebra Tiles. We were given tiles which related to Algebra. Algebra looked like this. The colored tiles were negative intergers. The white tiles were positive intergers. The little square is a 1. The long tile is the variable. While the big square is a variable squared.In grade 8, you would only need to know about the long tiles and the small squares. In grade 9, you would use all 3.We then learned about the terms we would need to know for Algebra.TermsVariables- n/x/any letter- any number can be a variableConstants- +1/-1 -the number that never changesIntergersWhen you have intergers, think money.- = owe money+ = have money We were then given practice questions to do.Somethings to know before doing these qustions.1 .Simplify liked terms2 .Always try to have one variable & one constant on the other side of the equal sign.3 .Variable goes first.Here is some of the questions:Example 1: This is how the question would look like first(4n)(-2)(+1)(-3n). If you dont get the way the question is, you can put bubbles to seperate the intergers.Then you notice that i put a red X through the white and green variable. That shows that there was a zero pair.Next you simplify the liked terms. Where you get one positive variable and one negative 1. Death Blow of IntergersIn this section, we talked about how if theirs intergers in questions with brackets, its a different story.6 -(-3) When you see there are (-) signs touching, it means you can add.6 + 3 = 96-(-3+2) When you get something like this, you do the brackets first.6-(-1) = 7 Notice how the -(- looks like a plus sign. Thats a key trick when remembering (-) touch mean adding. ConclusionIn class, we learned about algebra and got a ton of homework. Which im almost done so go me ! And thats all of my scribe post.[...]

Marlon's Scribe



Pg 1

Write the following expressions in words
1. 2x-9
2. 10-4x
3. 5(x-8)
4. 7(x+5)

Write the following statements as algebraic expressions

5. 6 centimeters more than two thirds of length x
6. three times the sum of a number and two
7. nine decreased by two times a number
8.four less than five times a number
whole page /8

Pg 2

The following graph shows the first four terms of a pattern.
A) Create a chart that shows the first 10 terms of the pattern. 3 Marks
B) Write the algebraic expression for the relationship between the hours spent walking and the number of kilometres walked. 3 Marks
C) Using your algebraic expression determine how far they could walk after 50 hours. 2 Marks
whole page /8
Whole Test /16

Jessica B's B.O.B.


Surface Area
The surface area is the measurment of the outside part of a shape.


^^CLICK for bigger picture^^

Volume is the measurement of how much space a shape takes up.

^^CLICK for bigger picture^^

Jessica Q's Scribe Post


Circumference of a Circle:
  • The circumference(c) of a circle is the distance around the circle.
    c = 2πr
  • The radius (r) of a circle is the distance from the center of the circle to the outside.
  • The diameter(d) of a circle is the length of half of the circle or twice the length of the radius.
  • π or pi is a constant and is approximately equal to 3.14
    Radius: d / 2
    Diameter: 2 x r
    Circumference: 2 x π x r

(image) (image) (image)

Area of a Circle:

Radius² - Area of a circle
- Area of circle = πr²
π (Pi) - 3.14
The Area - (3.14)(r²)

Surface Area of a Cylinder:


Volume of a Cylinder:
Volume = Area of base x height


Chaseley's BOB


Surface Area Of a Rectangular Prismsurface area is the total amount of area a whole 3D shape contains.formula: area front + area back+area side+ area side2+area top+area top+area bottom.area front + area back = L x Warea side + area side2 = W x Harea top+ area bottom = L x H SA = area front + area back+area side+ area side2+area top+area top+area bottom. SA= 2 (L x W) + 2(W x H) + 2 (Hx L)SA= 2 (4cm ² x2cm ²) + 2 (4 cm ² x 2 cm ²) + 2( 2cm ² x 2cm ²)SA= 2 (8cm ²) + 2 (8 cm ²) + 2 (4 cm ²)SA= 16cm ²+16cm ²+8cm ² SA= 40 cm ²looks complicated ? REALLY ITS NOT :) ___________________________________________________________volume of a rectangular prismV=(L X W) x HV= (17cm ² x 11 cm ²) x 1 cm ²V= 187 cm ² x 1cm ²V=187cm³Volume is the amount of space an object takes up.FORMULA: LxWxH= volume³[...]

Lukes BOB



Anthony's BOB


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It was working at my house, but when I tried it at school and it wasn't working.
If you can't see it ill try to make another one...

Dhonell's Bob


Surface Area
Surface Area is the area of the outside of a shape. Im going to show you how to get the surface area of a rectangular prism.
First you need to make a net. The net shows the front, the back, the top, the bottom, and the sides. But the front and the back are the same area, the top and bottom are the same, and so are the sides.

Once you have your net. You use the simple formula for adding the measuerments. (LxW)(WxH)(HxL) Since the net is flat, you have to square the number.

Well after you use the formulas with the measurements, you can add it up and get the surface area. You can use the example I gave you to help better understand.

Volume is how much the entire shape takes up. To get the volume of a rectangular prism, you multiply the length (L), width (W), and height (H). That will get you the volume of the entire shape. The answer, is always cubed or in 3. ex. 18 cubic(3) centimeters.

Kate's BOB


Finding the Surface Area of a Rectangular PrismTo find out the Surface area of a Rectangular Prism the first thing you have to do is make your object into a net so it looks like this:(Surface Area : Surface area is the measure of how much exposed area an object has)After Laying out your Rectangular Prism into a net you have to find the area of each shape. So to find the surface area of the whole object you have to find the area of each shape and add them together like this:The Front and back Area = 8 x 4 = 32 cm ²The Sides Area = 8 x 4 = 32 cm ²The Bottom and the Top Area = 4 x 2 = 8 cm ²Then you multiply each one by two becuase there are two of the same shape. It makes things easier.32 x 2 = 6432 x 2 = 648 x 2 = 16Then you add all of those up and that gives you your surface area!64 + 64 + 16 = 144 cm ²Finding the Volume of a Rectangular PrismTo find the Volume of a Rectangular Prism is quit simple all you got to do is follow this formula:Length x Width x Height = Volume(Definition of Volume: The amount of space, measured in cubic units, that an object or substance occupies)Now all you got to do is plunk in your numbers and do the mathHeight x Length x Width = Volume10 cm x 6 cm x 4 cm = 240 cm ³(Since it is a three dimensional object we put cubed or ³)Thats all you have to do :) [...]

Marlon's Bob


Surface Area and Volume

Surface Area

I learned to get the surface area of a 3 dimensional shape. Lets say you have a rectangular prism, you first need to make the prism into a net. Now you have to find the front area, the back area, the top area, the bottom area, and both of the sides areas. The easier way is to find the area of the top area then double it, then double the area of the top area and find the area of one side then double it since theres two of everything. So it would look like this,



I learned to get the volume you need the formula L x w x h = v. For example if you had a book flat on the table with the length=18 cm, the width=21, and the height=6 you would use this formula.

It is cm3 (or cubed) because it is a 3 dimensional shape.

Mary's bob


(image) Surface Area of a Rectangular Prism .
Surface area is the area of the surface on a rectangular prism .
Surface area = Length x height
= 2cm x 2cm = 4squaredcm
= 4squaredcm x 2 = 8squarecm
= 6cm x 2cm = 12squarecm

= 12squarecm x 4 = 48squarecm
Surface area = 48squarecm

The volume of a rectangular prism is how much space it takes up .
Volume of rp = length x width x height
length = 6cm
width = 2cm > 6 x 2 x 2 = 24squarecm *
height = 2cm
Volume of rp = 24squarecm

Dharyll's B.O.B.


(image) What I learned About Volumes and Surface Area
I learned that to get the volume you the to use a formula.
l x w x h =

3 x 3 x 3 = 27cm3

27 cubes = 27cm3

To get the Surface Area you also need a formula. You also have to add all the area of the square, top, bottom, sides, the back and the front.

Surface Area = 3 + 3 + 3 + 3 + 3 + 3 = 24 cm2

Jocelyne's B.O.B.


Jocelyne's B.O.B.SURFACE AREA: The surface area is the area of the outside part of a shape. For a rectangular prism it would be the 2 sides, the top and bottom, and the front and back. A net is an easy way to show the rectangular prism's area . The formula for this would be :surface area = area top + area bottom + area side + area side² + area front + area backORsurface area = 2(L x W) + 2(H x L) + 2(H x W)= 2(4cm x 2cm) + 2(2cm x 4cm) + 2(2cm x 2cm)= 2(8cm) + 2(8cm) + 2(4cm)= 16cm² + 16cm² + 8cm²= 40 cm² You can use the formula examples i showed you here to help you answer your own surface area question.VOLUME:The volume is the measurement of how much space the shape takes up. The answer is always cubed or in an exponent ³.The volume of a rectangular prism would look like this.The formula for this would be:volume = L x W x H= 3cm x 2cm x 2cm= 12 cm³ORvolume = area of base x height= 6cm² x 2cm= 12cm³ [...]

Jeanine's BOB



Surface Area of a Rectangular Prism:
Surface area is the total area of the prism. The measurements from the net all added up.
Surface Area = lengthxheight
= 4 cm x 4cm = 16cm(2)
=8cmx4cm=32 cm (2)
Then you add them all up.
16+16+32+32+32+32= 160cm(2)

Volume of a Rectangular Prism:
8x4x16 = 512 cm (2)
base = 96cm(2) ( you add up the three rectangles across the middle )
height = 16 cm(2)
96x16 - 1536
Volume = 1536 cm (2)

Robbie's Scribe


Today, Mr. Harbec thought us how to find the volume of any prism.
(picture below)

(sorry picture a bit small)

Alleys Scribe