2. 900 bricks
First find the volume of the whole brick wall, you multiply the length width and height, which is
450x18x108= 874, 800
Then since each brick's volume is 972 cm cubed, you divide 874800 by 972
874, 800/972= 900 bricks
3.200 revolutions
To find how many revolutions happened, you need to find the circumference of the wheel and see how many times the wheel rotated.
So the wheel's circumference is the diameter times pi, which is .7 times pi.
That is about 2.2 m.
The wheel traveled 440 meters so divide 440 by 2.2 and that will give you 200.08. But you need the complete revolutions, so round to the nearest whole number, 200. So 200 revolutions.
I'm not sure how to do #4, but I think you find the surface area of the cylinder and subtract the two bases from it.
Hope this helps.
