10 x 10 = 100 80 x 80 =6400 6400-100= 6300 so that would have to be 3150ft.
Answer:
30 books
Step-by-step explanation:
bookshelf is 45 inches
each book is 1 1/2 inches
45 / 1 1/2 = 30
30 books can fit on the shelf
Step-by-step explanation:
Longest side of cuboid: 7cm
Height of cylinder:
2 × 7 = 14 cm
Volume of cuboid:
7x3x4=84![cm^3](https://tex.z-dn.net/?f=cm%5E3)
Volume of cylinder:
![84=14\pi r^2 \\r=\sqrt{\frac{6}{\pi} } \ \ \ cm\\r=1.38 \ cm\\](https://tex.z-dn.net/?f=84%3D14%5Cpi%20r%5E2%20%5C%5Cr%3D%5Csqrt%7B%5Cfrac%7B6%7D%7B%5Cpi%7D%20%7D%20%20%5C%20%5C%20%5C%20%20cm%5C%5Cr%3D1.38%20%5C%20cm%5C%5C)
Surface area of the cylinder:
![\pi r^2 + 2 \pi r h](https://tex.z-dn.net/?f=%5Cpi%20r%5E2%20%2B%202%20%5Cpi%20r%20h)
![6+2\pi (\sqrt{\frac{6}{\pi} } ) (14)](https://tex.z-dn.net/?f=6%2B2%5Cpi%20%28%5Csqrt%7B%5Cfrac%7B6%7D%7B%5Cpi%7D%20%7D%20%29%20%2814%29)
=128 cm^2