Step-by-step explanation:
Objective: Recall the properties.
a) 3+1=4
b) 3+7=7+3
c) 3+(7+4)=7+(3+4)
d). 3(7+4)=(3×7)+(3×4)
Answer:
21
it is E20e not e20E
so the answer is A
3 is the correct answer tbyvcrdgevzc