Correct. The predicted European population in 2150 is $\displaystyle{1.5}\cdot{10}\cdot{9}={1.500000000}\cdot{{10}}^{{9}}\usepackage{cmbright}\Huge\$ (since multiplying by $\displaystyle{{10}}^{{9}}\usepackage{cmbright}\Huge\$ has the same effect as moving the decimal point 9 places to the right).