What is the difference of scientific notation. 0.00067 - 2.3 x 10⁻⁵

a. 6.47 x 10⁻⁴

b. 6.47 x 10⁻⁵

c. 4.4 x 10⁻⁵

d. 4.4 x 10¹

For this case we must find the difference of the following expressions:

For the second expression we must run the decimal 5 times to the left, because the exponent is negative, that is:

We subtract:

Represented in scientific notation we have:

Option A

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.