In this arithmetic sequence, what is the common difference?

11, 8, 5, 2

a) 3
b) -3
c) 5
d) -1

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)

Aramp rises 4 feet over a distance of 10 feet. what is the length of the ramp?

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?