A: 8.64 x
Step 1To find a, take the number and move a decimal place to the right one position.
•Original Number: 86,400,000
•New Number: 8.6400000
Step 2Now, to find b, count how many places to the right of the decimal.
New Number: 8 . 6 4 0 0 0 0 0
Decimal Count: 1 2 3 4 5 6 7
(There are 7 places to the right of the decimal place.)
Step 3Building upon what we know above, we can now reconstruct the number into scientific notation.
Remember, the notation is: a x 10b
a = 8.64 (Please notice any zeroes on the end have been removed)
b = 7
Now the whole thing:8.64 x