## Wednesday, February 23, 2011

### Textbook Volume Post

Pg.261
questions:18,19

18)Suki has 30 small linking cubes.

a)She wants to use 18 of them to make a large cube,Is this possible?
Why or not?

b)what number of linking cubes would she use to construct the largest cube she can possibly make?

a)There's no whole number that can be cubed to equal 18,so NO.
b)Suki would have to have 27 more cubes to make 3x3x3 cubed.

19)Melissa has three glass vases,She wants to use one as a decorative fish tank for Harvey the guppy.Which will give Harvey the most water to swim in?

The volume of the cube is 343 cm3
The volume of the rectangular prism is is 360 cm3
The volume of the triangular prism is 367.5 cm3

The guppy will have more water to swim in the triangular prism!

Cylinder and Volume Question's

I solve the problem like this
a) V=pi.r.r.h
V=(3.14x3.5x3.5)x23
V=78.5x25
V=1806.5cm^3

b)V=pi.r.r.h
V=(3.14x14x14)x12
V=61.44x12
V=7385.28cm^3

c) V=pi.r.r.h
V=(3.14x0.5x0.5)x1.5
V=12.75x1.5
V=19.125cm^3

R=D/2
D=0.8
o.8/2=R
R=0.4cm^3

V=pi.r.r.h
V=(3.14xo.4xo.4)x10
V=o.5024x10
V=5.024m^3

Chapter 2

(+2) x (+3)=+6
(+2) x (-3)= -6
(-2) x (+3)=(+6)
(-2) x (-3)=+6

#### 1 comment:

1. Good job Samara! I like how you have an image, but to make it better you could have added a video, link or something from flitsi.com. I wish you could add some work to it, like how you got the answer, because those are just the answers.