Final answer:
Tara must walk 3/10 of a mile to get from her house to Javier's house.
Step-by-step explanation:
The question is asking how far Tara must walk to get from her house to Javier's house, assuming a direct path between the two houses.
Tara walks 7/10 of a mile to school, while Javier walks 4/10 of a mile to school.
We can find the distance between their houses by subtracting the distance Javier walks to school from the distance Tara walks to school.
Therefore, the distance Tara would have to walk to get to Javier's house is 7/10 - 4/10
= 3/10 of a mile.