Hey, pls help. For spanish

What is one difference between schools in spain and costa rica? a. the lunchtime for students b. the two class shifts available c. the time when school starts d. the school food menu choices

Sheila conducts an investigation to see how the amount of salt dissolved in water affects the density of the water whichstatement best describes the correct plan for her procedure? the density and the amount of water are controls, and the amount of salt and the type of salt are variablesthe amount of water and the amount of salt are controls, and the type of salt and the density are variablesthe type of salt and the amount of water are controls, and the amount of salt and the density are variablesthe type of salt and the density of water are controls, and the amount of salt and the amount of water are variableso

Select the best translation for the following term or phrase. what did i do? ¿qué es eso? ¿qué puedo hacer? ¿qué quiere decir ? ¿qué hice?