So you know that for arithmetic sequences, the difference between each term is the same. So we can use this to form an equation:
Difference between term 2 and 1 = Difference between term 3 and 2

So the three values are:
<u>
</u>5, 0.5(5)+7, 3(5)-1
=
<u>5, 9.5, 14</u>
I mostly this it is negative 7 I hopefully hope that this may have help you If not im very very sorry
I think 18, 30, 54 is correct
Answer:
10000 meters
Step-by-step explanation
To find perimeter you add the length of each side of the shape. Since the land is a rectangle there are two pairs that are parrallel, being 2000 and 3000. Making the distance 2000 + 2000 + 3000+ 3000 = 10000
Hope this helps!