Answer:
5 is the third member of the stream triple
$ 7.37
Step-by-step explanation:
linear increase means increased the same amount every year
increment: (6.21 - 5.39) / 4 = 0.215 =$0.22
1n 2009: 0.22 * 9 + 5.39 = 7.37
Which one?
/ \
l
<-------l------->
| |
Y Z
They are now congruent.
Sorry!
It's pretty bad.