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

25/4

step-by-step explanation:

call segment cd's length x. because dc and ab are parallel, angle acd and cab, so triangles adc and abc are similar and we can set up the equation x / ac = ac / ab, or x / 5 = 5 / 4 and x = 25/4.