Answer this for me please

Question

A geometric sequence is defined by the equation an = (3)3 − n.

Part A: What are the first three terms of the sequence?

Part B: What is the value of r?

Part C: What is the value of a11?

Answer 1

If you had intended to write  a_n = (3)^{3 − n}

then you would, indeed have a geometric sequence.

 

Subscripts & exponents MATTER, as does parenthesization.  (Actually, in the version that I supplied above, those parentheses would not be needed.

 

To develop a₂ all that you must do is to substitute n=2 into the proper formula, and for a₃, just substitute n=3, etc.

Very DOable!