PLEASE HELP!! Spanish conjugation AND translate the sentence

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

What's the correct form of the verb in parenthesis? mi profesor 1. (estar) de buen humor y no 2. (decir) nada. primero, yo 3. (poner) mi ipod en mi mochila por la mañana es lo que siempre hago. antes yo lo 4. (poner) en mi bolsillo en mis pantalones, pero recientemente 5. (empezar) a colocarlo en la mochila.

Write a paragraph, in spanish, giving advice to a friend about the dos and don’ts of staying safe at the beach.