To solve for \( x \) in the context of the trapezoid described, we can use the property of the median (also known as the midsegment) of a trapezoid. The median of a trapezoid is calculated by taking the average of the lengths of the two parallel sides.
In your case:
- The lengths of the parallel sides are given as 11 and 17.
- The median is given as \( 4x - 30 \).
Using the formula for the median of a trapezoid, we have:
\[ \text{Median} = \frac{\text{Length of top side} + \text{Length of bottom side}}{2} \]
This translates to:
\[ 4x - 30 = \frac{11 + 17}{2} \]
Calculating the right-hand side, we get:
\[ 4x - 30 = \frac{28}{2} \] \[ 4x - 30 = 14 \]
Now, we need to solve for \( x \). First, we can add 30 to both sides:
\[ 4x = 14 + 30 \] \[ 4x = 44 \]
Next, divide both sides by 4:
\[ x = \frac{44}{4} \] \[ x = 11 \]
Thus, the value of \( x \) is \( 11 \).
Looking at the options provided:
- 4
- 11
- 9
- 6
The correct answer is \( \boxed{11} \).