Correct. Regroup: $\displaystyle{\left({8.3}\times{3.1}\right)}{\left({{10}}^{{9}}\times{{10}}^{{-{{11}}}}\right)}\usepackage{cmbright}\Huge\$

Multiply the numbers: $\displaystyle{\left({25.73}\right)}{\left({{10}}^{{9}}\times{{10}}^{{-{{11}}}}\right)}\usepackage{cmbright}\Huge\$

Use the product rule: $\displaystyle{25.73}\times{{10}}^{{{9}+{\left(-{11}\right)}}}={25.73}\times{{10}}^{{-{{2}}}}\usepackage{cmbright}\Huge\$

Convert 25.73 into scientific notation, regroup, and use the product rule: $\displaystyle{2.573}\times{\left({{10}}^{{1}}\times{{10}}^{{-{{2}}}}\right)}={2.573}\times{{10}}^{{{1}+{\left(-{2}\right)}}}={2.573}\times{{10}}^{{-{{1}}}}\usepackage{cmbright}\Huge\$