Question

What is the sum of 4.2 × 105 and 5.3 × 10^5?

Answer 1

Answer:

Option C.

Step-by-step explanation:

The two expressions are $4.2\times 10^{5}$ and $5.3\times 10^{5}$

We have to find the total of these two terms.

$(4.2\times 10^{5}$ + $5.3\times 10^{5})$

Now we take out $10^{5}$ as a common term.

$10^{5}(4.2+5.3)$

= $9.5\times 10^{5}$

Therefore, Option C. will be the answer.

Answer 2

(4.2*105)+(5.3*10^5)
441 + 530000
530441

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If your problem is (4.2*10^5)+(5.3*10^5), it would be 
420000 + 530000
950000