Is a number in scientific notation?

Give the expanded form of the following scientific notation.

How is expressed in scientific notation?

Rewrite the following number in scientific notation:

What is the next number in the series?

What is the next number in the following sequence?

The first term of an arithmetic sequence is . If the second term is , and the third term is , what is the tenth term of the sequence?

Express in scientific notation.

Give the expanded form of the following scientific notation.

Simplify .