## Elementary Technical Mathematics

$$2.0 \times 10^{11}.$$
We simplify the numerator and denominator by adding the exponents and multiplying the like terms and then by subtracting the exponents and dividing the like terms, as follows: $$\frac{(5\times 10^{4})(3\times 10^{-5})(4\times 10^{6})}{(1.5\times 10^{6})(2\times 10^{-11})}=\frac{(5)(3)(4)\times 10^{4-5+6}}{(1.5)(2)\times 10^{6-11}}\\ =\frac{60\times 10^{5}}{3\times 10^{-5}} =20 \times 10^{10}=2.0 \times 10^{11}.$$