Write 0.000 000 607 in standard form.
Write 3.09 × 105 as an ordinary number.
Work out 6.2×104×1.5×1082×10−5\displaystyle \frac{6.2 \times 10^4 \times 1.5 \times 10^8}{2 \times 10^{-5}}2×10−56.2×104×1.5×108
