Answer:
Find the two ways to find the difference of : 
First way:

To convert this fraction into decimal.
We have to make the denominator 100.
i.,e

now,

Second way:
Convert
to
and 4.93 to
,
Now:

Order of operations
Parenthases
Exponents
Multiplacation
Division
Additon
Subtraction
so go down the list start with parentheses and go down
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Answer:no there are 3 more tens because 10 + 40 =50
Step-by-step explanation:
Answer:
5.2689 × 107
Step-by-step explanation:
Its been a long time since I did scientific notation but theres your answer.
Wish i could of made it clearer but i'm still learning
Hope it helps