Question

1. (8 x 10^9) - (3 x 10^7)
2. (6.5 x 10^2) + (5.4 x 10^4)

Explanation:

Step1: Calculate the first - term of the first expression

$(8\times10^{9})=8000000000$

Step2: Calculate the second - term of the first expression

$(3\times10^{7}) = 30000000$

Step3: Subtract the second - term from the first - term in the first expression

$8000000000-30000000=7970000000 = 7.97\times10^{9}$

Step4: Calculate the first - term of the second expression

$(6.5\times10^{2})=650$

Step5: Calculate the second - term of the second expression

$(5.4\times10^{4})=54000$

Step6: Add the two terms in the second expression

$650 + 54000=54650=5.465\times10^{4}$

Answer:

The results are $7.97\times10^{9}$ and $5.465\times10^{4}$ respectively.