Hello!
The approximate predicted number of stamps she collected in the 25th month is 990.
Explanation:
The ordered pairs are as follows:
( 1, 30), ( 2, 70), ( 3, 110), ( 4, 150), and ( 5, 190).
The pattern visible is that each month the value increases by 40 from each previous month.
The equation you would have to do in order to see how many stamps she collected is:
+
×
+
Hope this helps!