Final answer:
Jacob's mixing of French and Spanish words is due to language interference, a common issue when learning multiple languages. Bilingual education can help to reinforce learning and improve fluency, and practicing distinct separation of languages can reduce interference.
Step-by-step explanation:
Jacob's problem of writing a French word when intending to write a Spanish one is likely due to language interference, which is common among individuals learning multiple languages.
This happens when the rules or vocabulary of one language affect the use of another.
Bilingual education strategies can help mitigate this by immersing students in both languages to reinforce learning and improve fluency in each.
To minimize this issue, Jacob can practice distinct separation of languages during learning sessions, alongside increasing his familiarity with commonly used words in both languages to reduce misspellings.