Please help... math

[gregdrummeraz]

The St. Louis River tank is a trapezoidal prism. The height of the trapezoidal base is 24 ft, and the two bases are 3 ft and 7 ft. If the height of the tank is 3 ft 6 in., what is the volume of the tank?


I'm Stumped... again.

 

[dukebound85]

height times average of bases is the area

then times it by the depth to get volume

 

[siurpeeman]

more generally, the volume of a prism can be found by multiplying the base area and the height of the prism. and as the above poster mentioned, the area of the trapezoid is the average of the bases times the height.

 

[gregdrummeraz]

Here were my choices.

420ft^3
400ft^3
380ft^3
375ft^3

 

[dukebound85]

Edit: just use the above equations to get answer

it is one of the choices lol

 

[TuffLuffJimmy]

Four twenty!

maybe you should have listened to what the other posters said and tried to learn something for yourself.

 

[gregdrummeraz]

And I think it is either 380 or 420..


idk.. I really suck at this kind of math.

 

[dukebound85]

And I think it is either 380 or 420..


idk.. I really suck at this kind of math.

for your benefit

A=3.5 *(7+3)/2
A=17.5ft^2


V= 24 *A=24*17.5
V=420ft^3


I hope you get the hang of following equations as if you go into any scientific major in college and cant do this, you are well in trouble lol

 

[TuffLuffJimmy]

apparently you're not too great at reading threads either...


the answer has been given

 

[dukebound85]

apparently you're not too great at reading threads either...


the answer has been given

to be fair, we all posted at 1:44