1. a. Determine the scalar equation of the plane containing the points:
A (1,2-5), B (-3,1,1) and C (1,1,1)
b. If D = (-3, 2,5), is D on the same plane as A, b and C? If not find
the shortest distance between the point D and the plane
containing A, B and
C​

Sophia wrote an equation to represent the revenue of a movie theater for one day. she let x represent the number of child tickets sold and y represents the nunver of adult tickets sold. if a child ticket cost $4, an adult ticket cost $6, and the total revenue for the daybwas $420, which equation could sophia use to represent the number of chikd and adult tickets that were sold?