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Answer:

1.0915  ×  10 ^9

Step-by-step explanation:

Move the decimal so there is one non-zero digit to the left of the decimal point. The number of decimal places you move will be the exponent on the  10 . If the decimal is being moved to the right, the exponent will be negative. If the decimal is being moved to the left, the exponent will be positive.

The  circumference of Earth's moon to be 1,091,500,000, the scientific form is expressed as 1.09 * 10⁹


Converting standard number to scientific notation

The standard expression for a scientific notation is expressed as:

[tex]A\times 10^n[/tex]

where:

A is any real number between 1 and 10

n is any integer

Given the  circumference of Earth's moon to be 1,091,500,000, the scientific form is expressed as 1.09 * 10⁹

Learn more on scientific notation here: https://brainly.com/question/106363