Which is equivalent to (-2 + 4i)(7 + 2i)?
a) -11
b) -5 + 6i
c) -6 + 24i
d) -22 + 24i

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?