Please help due today

19. fill in the blank with the correct conjugation of the verb in parentheses. (estudiar) en la biblioteca

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

Which verb form best completes this conversation? eric: ¡qué frío¡ estamos a 8ºc. y mañana la temperatura bajará a 1ºc. pedro: mucho frío. a. será b. estará c. hará d. hizo