Find the Term of the Sequence Whose First Several $3$

question 92

Essay

Find the term of the sequence whose first several terms are $3$ , $- \frac { 1 } { 9 }$ , $27$ , $- \frac { 1 } { 81 }$ , ... .

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Definitions:

Cornea

A transparent area on the front of the outer layer of the eye that acts as a window to let light into the eye.

Pupil

The opening at the center of the iris, which grows smaller or larger as the iris contracts or relaxes, respectively; it regulates the amount of light that enters the eye.

Lens

A clear, circular disc located in the eye, just posterior to the iris, that can change shape to help the eye focus images of objects that are near or far away.

Eye Safety

The practice of taking preventative measures to protect the eyes from injury, strain, or infection.