Can somebody help me with these Spanish questions please?

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

12 á á é in n ó ó ú ú o choose the answer that best relates to the class or field of study listed below. el francés a. el arte b. la informática c. las ciencias d. las lenguas select the best answer from the choices provided

Alex: ¿alguien puede traerme los cuchillos? gloria: por favor. son peligrosos. a. ¡no los se traiga! b. ¡no se los traiga! c. ¡no se lo traiga! d. ¡no lo se traiga!