Question

Express in scientific notation. make sure your answer has the same number of significant figures as the starting value. 1,645.6 = _____ 1.64563 1.6456 x 10-3 1.6456 x 103

Answer 1

1,645.6 in Scientific Notation: 
1.6456 x 10
3

Hope this helps!! 
(If not I'm sorry!! I tried and it's 2:30 a.m) 

Answer 2

Answer:

$1,645.6=1.6456 \times 10^{3}$

Step-by-step explanation:

The starting value is

$1,645.6$

Now, the whole part of a scientific must between 0 and 9, and we will preserve the same number of significant digits, that is, the same digits will remains.

Also, observe that the decimal point is between 5 and 6. We need to move the decimal point between 1 and 6, as follows

$1.6456$

Then, count the number of spots we moved the decimal point. We moved 3 spots, that meanst the exponent of the scientific notation is 3. Applying all these things, we have

$1,645.6=1.6456 \times 10^{3}$

Therefore, the right answer is the last choice.