Question

Write an explicit formula for An, the nth term of the sequence 75, -15, 3, ....

Answer 1

aₙ = 75 * (-1/5)ⁿ⁻¹

Explanation:

75, -15, 3, ..

75, 75*(-0.2), 75*(-0.2)*(-0.2)

aₙ = a₁ * rⁿ⁻¹ a₁ = 75 r = - 1/5 (-0.2)