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Question 4 Given the sequence: 10, 8, 6, 4, . . . what is the explicit formula? O an = 10 -n O an = 2n - 10 O an = 12 - 2n O an = 10 - 2n Question 5 If a1 = 2, an = 3an-1 +1, what is a2 ? 0 6 07 0 5 0 4 Question 6 An alternating geometric sequence with first term 4 and ratio -2 is: O 4, -2, 1, -0.5 O -4, 8, -16, 32 O 4, -8, 16, -32 O 4, 8, 16, 32