What is the volume of the trapezoidal right prism?

https://lh3.googleusercontent.com/PICBeofvP7HLSvjtLcpDky5XJ8EK_KEDLDDIYOxvPlyhzjJqxpSf3iWyxIdB4qCTSUvDmg=s89

A.
846 m3

B.
720 m3

C.
423 m3

D.
56 m3

Question

What is the volume of the trapezoidal right prism?		
  

https://lh3.googleusercontent.com/PICBeofvP7HLSvjtLcpDky5XJ8EK_KEDLDDIYOxvPlyhzjJqxpSf3iWyxIdB4qCTSUvDmg=s89


 
 A.
846 m3
 
 B.
720 m3
 
 C.
423 m3
 
 D.
56 m3

anonymous · Answer

srry if the image is blurry, heres the real image. http://static.k12.com/calms_media/media/1422500_1423000/1422963/1/5cbfd2601f5f6870f81f1c2344d50b20cfa652c3/MS_PA_131002_171322.jpg

anonymous · Answer

it's not blurry

anonymous · Answer

can you tell me how to figure this problem out, i'm so confused

anonymous · Answer

what grade is it for?

anonymous · Answer

7th grade Pre Algebra

anonymous · Answer

can you help me @helper99  ?

anonymous · Answer

that is funny i took that class  and yes give me 1 sec

anonymous · Answer

okay thank you sooo much!!! :)
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anonymous · Answer

it is 423 so C

anonymous · Answer

how do you get that?

anonymous · Answer

@helper99

anonymous · Answer

well i looked at the picture and found w=3 l=40 a=3 b=7 h=6 and next i put that into the formula V = H[ab + 0.5(W-a)b + 0.5(L-b)a + (1/3)(W-a)(L-b)]

anonymous · Answer

oh okay, i think i get it now...... i just looked at my book and it says that you can also use V=lxwxh, so i guess i just didn't look, thank you for the help, i appreciate it!!!

anonymous · Answer

if you need any more help @ my name ill come to the question im on here for the next about 3 hours

anonymous · Answer

okay, thanks for letting me know!!!