Respuesta :
Answer:
9 + 10 = 19
1 + 2 = 3
Step-by-step explanation:
To add 2 to 1, look at a number line and start at the point 1 and go two numbers to the right to end at 3.
Answer:
I believe its 22
Step-by-step explanation:
9+10=19
19+1=20
20+2=22