The one that is not covered up is hard for us can someone answer this?

What is (28 + 7 + 6 + 3) x 1/2 show your work

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

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field