21 Which equation is equivalent to 2 x + 4? A x + x + 1 + 1 + 1
B 1 + 1 + 1 + x
C x + x + x + x
D
+ x +4

21

jk it's 20

step-by-step explanation:

180-142=38 for the acute angle next to the entry

90+38=128

180-128=52

a=52

step-by-step explanation:

22

step-by-step explanation:

22

the first domain and range set to the left is matched with the top relation, and the second set the set in the middle goes with the bottom relation.