Write 0.00089 in standard form.

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8.9 x 10^-5

89 x 10⁴

89 x 10⁵

8.9 x 10^-4

answer is A.

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Detailed Solution

The standard form of a number is a way to express it using the format "a x 10^b " where $1 \leq a < 10$ and b is an integer. This is also known as scientific notation.

In this case, to express 0.00089 in standard form, we want to move the decimal point four places to the left to get 8.9, which is between 1 and 10, and the exponent will be -4 (indicating that we moved the decimal point 4 times to the left).

Therefore, 0.00089 = 8.9 x 10^-4.

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