0.0084 has _ significant figures.

Explanation

Significant figures are the meaningful digits in a number that indicate its precision. In 0.0084, the 8 and the 4 are considered significant because they contribute to the number's value. Zeros before the first non-zero digit (here, the 8) are not significant; they just indicate the decimal's placement. Therefore, in 0.0084, only the 8 and the 4 are considered significant figures.