Perimeter/ area help please?

http://s1324.beta.photobucket.com/user/Marcelia1/media/Mathsucks.png.html?sort=3&o=0

My answers:
1)
A=15ft^2
P=18ft

2)
A=7.5m^2
P=26.8m

3)
A=80.52in^2 ( or 52.3in^2)?
P=26.8in

4)
SA=979.68yd^2 ( or 602.9yr^2)?
V=2260.8yd^3

5)
SA=190cm^2
V=126cm^3

6)
SA=726mm^2
V=1331mm^3

Am I correct?

Question

Perimeter/ area help please?

http://s1324.beta.photobucket.com/user/Marcelia1/media/Mathsucks.png.html?sort=3&o=0

My answers: 
1)
A=15ft^2
P=18ft

2)
A=7.5m^2
P=26.8m

3)
A=80.52in^2 ( or 52.3in^2)?
P=26.8in

4)
SA=979.68yd^2 ( or 602.9yr^2)?
V=2260.8yd^3

5)
SA=190cm^2
V=126cm^3

6)
SA=726mm^2
V=1331mm^3

Am I correct?

anonymous · Answer

#3 and #4 I solved twice but got two different answers... Which are right?