Surface Area and volume

Rectangular Prism

Top= LxW= 10x5=50 m²
Front= LxW= 10x6=60 m²

Side= LxW= 6x5= 30 m<sup>2


TSA= 2 (T+F+S)</sup>

^{TSA= 2 (50+60+30)}
TSA= 2 (140)
= 280 m²

^{Triangular prism}

^{LxW = 5x7= 135 cm}

^Bxh÷2

8x9 ÷ 2

72÷2 = 36 cm

135 + 36 +36 = 207 cm²

^Cylinder

^{S.A = 2 (pie r 2} ) + (pie x d x h)

^{S.A= 2 (3.14 x 4 x 4) + (3.14 x 8 x 12)}

^{S.A = 2 x 50.24}

^{100.48 + 301.44 = 401.92} mm²


V=π.r.r.h
V= 3.14 x 6 x 6 x 15
V= 1695.6 cm³

B x H ÷ 2 x H
^{5 x 3}

Textbook questions

10. Kai uses an entire can of paint on a square backdrop for the school play. The label on can states that one can cover 27 m squared of wall surface. Estimate the backdrop's side length to one decimal place.

Answer 5.2 m √27 = 5.2

19. Estimate the square root of 160 100. Explain how you determined your estimate.

√160= 40

√100= 10

40x10= 400 answer 400

A) The area of the picture is 324 m2.

B) The area of the board is 1296 m2.

C) The dimensions of the board is 36 x 36.

Michael's textbook questions 5,6, and 7

Question 5 (page 148)

Ravi purchased 3 DVD's for 19.99 each. Find the total cost for the DVD's include 5% GST and 6% PST.

3 dvd's= 19.99 x 3 =59.97

tax = 11% 59.97 x 0.11= 6.6

11% = 6.6

59.97+6.6= $67.6 3 DVD's plus tax is total to $67.6

Question 6

A store discounted items by 50% off the original price one week. The following week an additional 10% was taken off the already reduced price. The regular price of a CD player was $85.00. What is the reduced price in the second week?

First week

50% off of $85.oo is 85.00 x 0.50 =$42.5

second week

10% off of $42.5 42.5 x 0.10= 4.25 42.5 - 4.25 = $ 38.25

Question 5 (chapter review)

2/5% of325 = 1.3

15 1/4% of 950= 144.88

175% of 125.50- 219.63

Michael's pay it forward

Part 1

What is "Pay it Forward". To complete this part please edit and revise the paragraphs that you wrote after watching the movie.

Pay it forward is helping other people by giving them
food,money and pay it forward by helping someone else so they can pass it on.

Part 2

What was your Pay It Forward act of kindness?
Why did you choose this activity?
Who
did you help?
What



did you do?
When
did you do you act of kindness?

Our pay it forward kindness was donating clothes to value village,giving food to
winnipeg harvest, we also raked my relative's backyard and babysitting foster kids.We chose
this activity because we had extra clothes that we don't use anymore and we can
give it to someone else, we can make a difference by giving other people food.
We helped my relatives, other people that goes to winnipeg harvest for food.
We went to costco to donate food to Winnipeg harvest,we raked my relative's
backyard,we donated clothes to value village and we babysat fosterkids. We did
our act of kindness last sunday.

Part 3

How did your act of kindness go?
What Happened?
How did you feel?
How did the person or people react?
Did you ask the person or people to "Pay It Forward"?
How did they react to your request?
If you did not ask the person to "Pay It Forward" how come?

How did your act of kindness go?
My act of kindness went great because we had so much fun and we helped
other people
What Happened?
We donated clothes and we asked the guy to pay it forward.
How did you
feel?
I felt great
because I helped other people and I made a small difference to other
people.
How did the person or people react?
They were shocked because they didn't know that grade 8'ers would be
donating clothes and making a difference.
Did you ask the person or people to "Pay It Forward"?
How did they react to your request?
I asked the guy from value village to pay it forward and he said he will
and we took a video of them saying pay it forward

Part 4

Why is the idea of "Pay it forward" important?

Has your act of kindness made a difference?

The idea of Pay It Forward was to make us help other people and make a difference and if we like it we will do it in the future. I think our act of kindness made a difference because we gave my grandmother a break of taking care of her foster kids and we also donated extra clothes to the less fortunate and donating food helped the "Winnipeg Harvest" a little bit, so we hopefully made a difference in some people's life.

Michael's Graphing Post

Bar graph
advantage of a bar graph is that it is best to use for comparing data across categories.
Disadvantage - it is used to seperate data.

Double bar graph
advantage- it is used to compare two sets a data
disadvantage-it doesn't show the true value

Circle Graph

advantage- its best for showing percents

disadvantage- you have to calculate to show the true value

Line graph

advantage- you can tell wheather a set of data is increasing or decreasing over time

disadvantage- can only be used to compare data over time

Pictograph

advantage- you can see which piece of data is higher or lower

disadvantage- you have to calculate to get the true value

2. How can graphs be misleading? show 3 ways

You can mislead a pictograph if you make one piece of data larger than the others.

You can mislead a bar graph by breaking the y-axis so the intevals will be more closer together.

You can also mislead a bar graph by making one bar larger.

2. a) A line graph or a bar graph would be best for comparing this set of data.

b)I would continue selling pizza subs because every week the sales are going up.

4. a) I would choose a line graph because it shows the data more accurately.

b)

Michael S 8-17

Michael's Propotion Post

Ratio- The relation between two similar numbers (1:2)
Rate- A comparison of two quantities measured in different units. $1.69 per 100 grams or $1.69/100 g is a rate for purchasing bulk food. 72 beats per minute or 72 beats/min is a heart rate.
Proportion- An equation which states that two ratios (fractions) are equal.

Task 2
1. 5 hours to travel 360 miles is about 72 mph

2. As a playgroup worker, if I increase the amount of apple juice I am serving at the playgroup from 25 ml to 100 ml, how much should I increase the the orange juice to, to keep the quantities in the same proportion? The orange juice is 50 ml to start with. You can just x2

Task 3
What are the three ways you can prove that equivalent ratio statements are true?
3/4 = 12/16 or 4/9 = 16/32 Three ways you can prove it is equivalent is cross multiply , horizontal, vertical, and diagonal.

4/9 = 16/32 is FALSE because what you do to the top and the bottom the answer is different.

Task 4

Task 5

http://www.concurringopinions.com/wp-content/uploads/2011/10/CrimeInAmerica2.jpg

1.Does this seem fair? This does not seem fair because the homeless guy only stole $100 and was sent to jail for 15 years. The rich guy stole 3million dollars and he got sent to jail for 40 months. The rich guy stole more but went to jail for less time then the homeless guy. This is not even close to being fair.

2.With what you know about proportion look and read what is in the image above.Does it seem just and fair? Why have you made this choice? It does not seem fair because the rich guy stole more money but went to jail for less time then the homeless guy. I've mad this choice because the judge is dumb for putting someone to jail that stole $100 and get put in jail for 15 years.

3. What would you have done if you were the judge? If i was the judge i would of put the rich guy in jail for 30 years and the homeless guy for 10 months.