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Earth to Neptune is the greatest distance. The number at the top is a power. So 22 to the power 4 is 22 x 22 x 22 x 22 = 234 256. 22 to the power 7 is 22 x 22 x 22 x 22 x 22 x 22 x 22 = 2 494 360 000. It is 22 to the power 3 larger which is 10 648 times greater.
The expression for (r-s)(x) is found by subtracting s from r. That difference is

. The expression for (r+s)(x) is found by adding them, which is

. Now we are told to evaluate (r*s)(x) which means they want us to multiply those and state the "new" expression that results.

. There you go!
So then what is the problem u need help with? I'd be happy to help.