Answer:
Step-by-step explanation:
3 rows of 21 sneakers.
If you add 21+21 it equals 42, which is two rows. If you add that last row, 42+21, you end up with 63.
Answer:
1
Step-by-step explanation:
note that 
= 1 for any value of n, thus
= 1
Answer:
-3 is the answer
Step-by-step explanation:
distribute the value of n
3+4-5×2
=7-10
=-3
You simply do it the same way as a positive number, just with a negative sign in front :)
