The height of the trapezium prism is calculated as: 17.3 ft.
Surface area of trapezium prism = (b1+b2)h + PH.
Given the following:
Substitute the values into (b1+b2)h + PH:
1508 = (35 + 11)14 + (50)H
1508 = 644 + 50H
1508 - 644 = 50H
864 = 50H
H = 17.3 ft
Learn more about Surface area of trapezium on:
https://brainly.com/question/15476307