Answer:
If I am correct, I think the surface area is 448.
Step-by-step explanation:
First start by finding the area of all the sides
Front side. 12 x 10 = 120
2 triangle sides: 8 x 10 = 80, 80 x 2 = 160
Bottom side: 6 x 12 = 72
Back side: 8 x 12 = 96
Then add up the surface area
120 + 160 + 72 + 96 = 448
Btw I don't know if I am correct, but I think this is the way you find surface area.
Since y must equal both 3x+2 and x-4, we deduce that 3x+2 and x-4 must equal each other. So, we have

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<em><u>They</u></em><em><u> </u></em><em><u>are</u></em><em><u> </u></em><em><u>adjacent</u></em><em><u> </u></em><em><u>angles</u></em><em><u>.</u></em>
<em><u>Both</u></em><em><u> </u></em><em><u>angles</u></em><em><u> </u></em><em><u>have</u></em><em><u> </u></em><em><u>common</u></em><em><u> </u></em><em><u>side</u></em><em><u> </u></em><em><u>and</u></em><em><u> </u></em><em><u>vertex</u></em><em><u>.</u></em>
<em><u>Hope</u></em><em><u> </u></em><em><u>it</u></em><em><u> </u></em><em><u>will</u></em><em><u> </u></em><em><u>help</u></em><em><u> </u></em><em><u>u</u></em><em><u>.</u></em><em><u>.</u></em><em><u>.</u></em>