Alguien q valla en la 116 1D , turno matutino , para ayudarme ? ​

Find the volume of the largest rectangular box in the first octant with three faces in the coordinate planes and one vertex in the plane x + 2y + 3z = 15.

Which function has the same domain as y=2x

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left