Thursday, February 17, 2011

Justin Lorenzo's Math Textbook Homework


Pages 259-260 Answers to # 7, 12, 14 (Math Textbook)


7.)

A) V= B x H ÷ 2 x H

V= 12 x 7 ÷ 2 x H

V= 42cm2 x 7cm2

V= 294cm3

B) V= B x H ÷ 2 x H

V= 8.1 x 2.2 ÷ 2 x 15

V= 8.91m2 x 15m2

V= 133.65m3

C) V= B x H ÷ 2 x H

V= 320 x 210 ÷ 2 x 400 / 67 200 ÷ 2 x 4

V= 33 600mm2 x 4mm2

V= 13 440 000 mm3
12.)

Base (cm)
7
18
20

Height Of Triangle (cm)
10
10
5

Height of prism (cm)
70
1080
700

14.)

V= B x H ÷ 2 x H

V= 15 x 8 ÷ 2 x 80

V= 60cm2 x 80cm2

V= 4800 cm3

If there are any other solutions, or mistakes I have typed please feel free to comment!






Which is the correct formula for volume?
Create your own poll at Flisti.com



















7.3

(picture1)

v = π r r h
v = (3.14x5cmx5xm) x 23
v = 1805.5cm3

7.4

(picture 2)

r=d/2 bxh1/2 x h2
r=25/2 40x35/2 x 140cm2
r=12.5cm2 = 98000cm3

v=π r r h
v= (3.14x12.5x12.5)x100
v=49062.5cm3


98000cm3 - 49062.5cm3 = 48937.5cm3


6 comments:

  1. Good job Justin! I liked how you have a picture, a video, flisti, and info. Although, i think you should have a link next time. Keep it up!

    ReplyDelete
  2. Great job Justin! You really planned it out and it looks easy to read. I agree with Marilen about adding a link. Also the flisti was a great idea! Keep up the great work!

    ReplyDelete
  3. Thank you for the comments and feedback, for my next post I will remember to add a link. :)

    ReplyDelete
  4. This comment has been removed by the author.

    ReplyDelete
  5. Great job Justin!
    I like how you used pictures of your work, I also like how you put a video, a flisti, and colour. Next time you should put a link in your work. Besides that everything is alright, keep up the good work.

    ReplyDelete
  6. Good Job Justin! I liked how you added pictures,flisti,and a video. Next time add a link to help us understand it or play games with. Overall Keep up the Goodwork!

    ReplyDelete