PLEASE HELP!! Only right answers ! Will mark brainlest!

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

50 points! 1. conjugate each of the verbs below in the preterite tense: ayer, mi abuela (leer) el periódico. los estudiantes (traer) los libros a clase. anoche, yo (enojarse) con mi hermana. julio (dormir) en clase anteayer. 2. below, conjugate the verbs in parentheses using either the imperfect progressive or the preterite. use the model below: modelo: yo 'estaba estudiando' (estudiar) cuando mis padres 'vinieron' (venir) a casa. i was studying when my parents arrived home. ella (bailar) cuando yo (romperse) la pierna. ellos (hablar) cuando nosotros (llegar).

Where are richie and his mother when the film begins? how do they earn a living?