i struggle with scientific notation.

Here are a couple of sites that you might find helpful

https://www.mathsisfun.com/numbers/scientific-notation.html

or here is a you tube clip

https://www.khanacademy.org/math/pre-algebra/exponents-radicals/scientific-notation/v/scientific-notation

6x10 to the 6th simply means that you move the decimal on 6 six places to the right, making it 6000000. The same idea is used for 2x10 to the 4th. Move the decimal on the 2, four places to the right, making it 20000. If the exponent is negative, the decimal place is moved to the left.