Answer:
11) Irrational number
12) Integer
13) Communitive property of addition
14) Distributive property of addition and multipacation
15) 26
16) 8
17) -41
18) 65
19) -5x-20
Step-by-step explanation:
Hope I helped
Answer:

Step-by-step explanation:
General equations are in the form 
So you can add 6 to both sides to make:

The length of DD' is 5.39 units.
Answer:
9 years old
Step-by-step explanation: All you have to do is 15-6=