To find the length of Javier's rectangular yard, we can use the formula for the area of a rectangle:
\[ \text{Area} = \text{Length} \times \text{Width} \]
We know that the area of the yard is 378 square feet and the width of the yard is 14 feet. We can rearrange the formula to solve for the length:
\[ \text{Length} = \frac{\text{Area}}{\text{Width}} = \frac{378 \text{ square feet}}{14 \text{ feet}} \]
Now, performing the calculation:
\[ \text{Length} = \frac{378}{14} = 27 \text{ feet} \]
So, the length of the yard is 27 feet.
From the options provided, the correct answer corresponds to:
- \( 2 \text{ tens} + 7 = 27 \)
Therefore, the length of the yard in feet is 27 feet.