Find an equation in standard form for the ellipse with center at (6, 9), horizontal major axis of length 6 and passes through the point (8, 8).

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.

Let w=23 . what is the value of w + 45 ?

X+ y = 5 ; x - y =3 solve using linear combination