This sequence represents the diameters of circles used to create an art project: 2.5 cm, 3.1 cm, 3.7 cm, 4.3 cm let f(n) represent diameter in centimeters and n the term number in the sequence. which equation represents the sequence of diameters?

We first determine the term-to-term rule in this sequence. 





We see that the term-to-term rule is adding 0.6 and the sequence is an Arithmetic sequence.

The formula to find the  term in an Arithmetic sequence is given
, where d is the difference between term

Hence for the sequence above, the equation is 

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