Answer:
or 
Step-by-step explanation:
we have

step 1
Group terms that contain the same variable

step 2
Combine like terms

step 3
Eliminate parenthesis

step 4
Factor the number 

Answer:
21x20= 420
Step-by-step explanation:
15 miles
15(64)+42=1002 mile - Andrea (42 is added because of her head start.)
15(67)=1005 miles - Parker
Answer: 2
Step-by-step explanation:
All you need to do is subtract
4-2=2