Which of the following statements best describes when to use the passive voice? When the subject is unknown or not necessary

When you know who did the action

When a person in the object of a sentence

When something gets destroyed

Calcula la concentracion de hidronio en la lluvia ácida si el ph es 4.35

Fill the blank with a la, a las, a los, or al. la profesora va escuela.

*fluent spanish speakers! * super easy request, can you me translate the following into spanish? don't use google translate, as it isn't accurate. it has been one week since i went to orlando. i visited my family and spent the week at disney world.