Answer:
the two would 20 miles apart on a coordinate grid .
Step-by-step explanation:
if you look at a 60 by 60 coordinate grid (40,-30) is 20 spaces away from (-60,-30).
brainly.it
Initial value is $400
Value after 9 years is zero
Change in value over 9 years is $400
<u>Rate of change is:</u>