Que premios recibió horacio quiroga

Can somebody me out with this spanish question? completa la oración con la voz pasiva con se. used cars for sale. carros usados. (the answer is not usa los or venta de)

Choose the answer that best relates to the class or field of study listed below la quimica a. la informatica b. la educacion fisica c. las ciencias sociales d. las ciencias

Achemist mixes 4 liters of one acid solution with 10 liters of a 40% solution, resulting in a 30% acid solution. what is the value of x, the acid concentration of the first solution