Answer:
$1200
Explanation:
So the equation will look like this if d is days and c is cost: c=100d+500 this is it because the $500 is only a one-time fee while $100 is the rate of change so it depends on the number of days you are on vacation. Now since we know how many days we have to go we can just plug it in d: c=100(7)+500
Simplify: c=700+500
Add: c=1200
Answer: $1200
Hope this helps!