Question

The 18th term of a sequence is 243, and the 90th term is 516.6. What is the 125th term?

Answer 1

do we know if this is a geometric or arithmetic sequence?

Answer 2

guess it depends on what kind of sequence it is

Answer 3

Right.

Answer 4

or neither o.O

Answer 5

I'm not exactly sure but the options are:
624.6
649.6
653.4
4,928.4

Answer 6

I get the 125th term as 649.6

This is the way I arrived at this answer:

90-18=72 terms between these two terms
516.6-243=273.6 is the increase between the 18th and 90th terms

273.6/72=3.8 which is the increase per term

125-18=107 terms between the 18th term and the 125th term
(107)(3.8)=406.6
406.6+243=649.6