Incorrect. Regroup: $\displaystyle{\left({4}\times{7.2}\right)}{\left({{10}}^{{7}}\times{{10}}^{{3}}\right)}\usepackage{cmbright}\Huge\$

Multiply the numbers and convert into scientific notation. Use the product rule. Then regroup the powers of 10 and use the product rule again. The number of krill eaten per day is $\displaystyle{2.88}\times{{10}}^{{11}}\usepackage{cmbright}\Huge\$ . The correct answer is 11.