Final answer:
The number 9.010 x 10^-6 has 4 significant figures.
Step-by-step explanation:
The number of significant figures in 9.010 x 10^-6 is 4 sig figs (c). In scientific notation, the number is written as 9.01 x 10^-6. In this case, all digits in the coefficient count as significant, including leading and trailing zeros. Therefore, there are four significant figures in the number.