Incorrect. Move the decimal point to the right until you get a number between 1 and 10. For the given number, this would be 1.53. Multiply the decimal by 10 raised to a negative power equal to the number of places you moved the decimal point. The decimal 0.000000000153 expressed in scientific notation is $\displaystyle{1.53}\times{{10}}^{{-{{10}}}}\usepackage{cmbright}\Huge\$ . The correct answer is $\displaystyle-{10}\usepackage{cmbright}\Huge\$ .