Answer:
1. El científico descubrió la fórmula matemática.
2. Marcos rompió los platos de porcelana.
3. Esteban y María volvieron de Costa Rica.
4. El futbolista murió de un ataque al corazón.
5. La actriz no dijo nada a la prensa.
6. Hoy el caso se resolvió.
Explanation: The original exercise asks to convert the sentences to past simple. In Spanish, the simple past is also known as the <em>pretérito perfecto simple</em> and it is characterized by the fact that its grammatical tense is absolute (it is estimated from who speaks and in relation to the time in which the expression is conjugated and the verb will depend on the termination of the verb in the infinitive ("ar" "er" or "ir").
