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Do you understand the given formula for the total surface area of the prism?

not that much

In your case you have a triangular prism. The bases are triangles.

|dw:1437328935002:dw|

Now we can work on the two components of the area and find the total surface area.

multiply

and divide by 2

\(\Large A_{triangle} = \dfrac{bh}{2} \)

so i need to do 30x16/2?

Multiply the base by the height and divide by 2. That is the area of each base.
What do you get?

Yes, exactly. Do that.

240 that is what i got

so would that be 480

How do I find out PH?

80

Correct.
Now look in the figure again.
What is the height of the prism?

16

so it would be 5?

|dw:1437330179269:dw|

|dw:1437330207419:dw|

Correct.
5 ft is the height of the prism.

450

*400

Really?
What is 8 * 5?

Oh. I see. Great 400 ft^2.

Now we finish by adding the two components of the area.
SA = 2B + PH
SA = 480 ft^2 + 400 ft^2

so now I do 400+480=880, is that my answer

Yes, 880 ft^2 is the answer.

Thank you so much, you just didn't help me find the answer but you also helped me understand

You are very welcome. I'm glad you understand it now.