Question

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

Answer 1

Answer is letter A

it is the answer

Answer 2

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

`0.00067\\2.3 * 10 ^ {- 5}`

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

`0.000023`

We subtract:

`0.00067-0.000023 = 0.000647`

Represented in scientific notation we have:

`6.47 * 10 ^ {- 4}`

Answer:

Option A