3. for the following geometric sequence, determine a1 and r and find an explicit formula for the sequence: 2, -6, 18, -54… a. what is a1? b. what is the common ratio r? c. write an explicit formula for an using the formula for geometric sequences an = a1*(r)n – 1.

Step-by-step explanation:

a1 is the first term.  In this case, 2.

r is the common ratio.  Each term is multiplied by -3 to get the next term, so r = -3.

an = 2 (-3)ⁿ⁻¹

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step-by-step explanation:

they can both be solutions depends on the equation

step-by-step explanation:

what is the equation? ?