Which of the following equations could be used to solve for the tenth term of the following sequence?

15, 13, 11, 9, ...

A (10) = 15 + 10 (-2)

A (10) = 15 + 9 (-2)

A (10) = 15 + 9 (2)

A (10) = 15 + 10 (2)

Why is scientific notation useful and how is scientific notation used in the real world?

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