Need help with some work that I got, everything should be in that image

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

Atorch and a battery cost 2.50 altogether.the torch costs 1.50 more than the battery.what fraction of the total price is the torch? give your answer in its simplest form.

Written as a simplified polynomial in standard form, what is the result when (2x+8)^2(2x+8) 2 is subtracted from 8x^2-38x 2 −3?