Answer:
x = 5
Step-by-step explanation:
The area (A) of a trapezium is calculated as
A = [tex]\frac{1}{2}[/tex] h(a + b)
where h is the perpendicular height and a, b the parallel bases
Here A = 70, h = x, a = 17 and b = 11, thus
[tex]\frac{1}{2}[/tex] x(17 + 11) = 70
Multiply both sides by 2 to clear the fraction
28x = 140 ( divide both sides by 28 )
x = 5
