Combine without using a calculator. Write your answer in scientific notation: $\left(6.42 \times 10^{-2}\right)-$ $\left(5 \times 10^{-4}\right)+\left(9 \times 10^{-3}\right)$

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The Answer of Combine without using a calculator. Write your answer in scientific notation: $\left(6.42 \times 10^{-2}\right)-$ $\left(5 \times 10^{-4}\right)+\left(9 \times 10^{-3}\right)$

Combine Without Using a Calculator (6.42×10−2)−\left(6.42 \times 10^{-2}\right)-(6.42×10−2)− (5×10−4)+(9×10−3)\left(5 \times 10^{-4}\right)+\left(9 \times 10^{-3}\right)(5×10−4)+(9×10−3)

Combine Without Using a Calculator $\left(6.42 \times 10^{-2}\right)-$ $\left(5 \times 10^{-4}\right)+\left(9 \times 10^{-3}\right)$