What is the value of the expression |a + b| + |c| when a = –6, b = 2, and c = –11?

a.
–3

b.
–15

c.
19

d.
15

Me i've asked this question 3 time asapright triangle abc and its image, triangle a'b'c' are shown below. algebraically prove that a clockwise and counterclockwise rotation of 180o about the origin for triangle abc are equivalent rotations.