Express in scientific notation (6.0x10^4) (3.1x10^-1)

The Answer is: 1.86×10^4

1.86 x 104

Explanation:

This mathematical operation is a multiplication, so:

1.- Multiply the number as usual: 6 x 3.1 = 18.6

2.- Multiply the coefficients, remember since they coefficients, a multiplication, actually you need to add them: 4 + (-1) = 3+

3.- Then you write the number with the coefficient: 18.6 x 103

4.- In this case since the scientific notation just admit one number will be:

1.86 x 104

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)