geometry
posted by lilman .
Concrete can be purchased by the cubic yard. How much will it cost to pour a slab 11feet by 11feet by 3inches for a patio if concrete costs $63.00 per cubic yard?
$211.75
$70.58 (my choice)
$317.63
$1,905.75
The volume of a cylinder is 980pi in^3. The height of the cylinder is 20in. What is the radius of the cylinder?
7in (my choice)
49in
327in
18in
Find the volume of the given prism. Round to the nearest tenth if necessary.
The prism looks like a rectangular prism with 10yd at ends and 29yds on top as if it is the base. the one end looks like triangle with 10yds twice.
2,511.5yd^3
1,255.7yd^3
1,025.3yd^3
1,450.0yd^3 (my choice)
Can someone please help and check my abswers, if I'm wrong maybe explain.

First two are correct.
Sorry, unable to decipher the third. 
all 3 are right. i had these questions on a quiz.

3rd is 1255.7yd^3