Nk + x = 10 solve for n

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

We have 339 ounces of jam to be divided up equally for 12 people how muny ounces will each person get

The architect's side view drawing of a saltbox-style house shows a post that supports the roof ridge. the support post is 8 ft tall. the distance from the front of the house to the support post is less than the distance from the post to the back of the house. how far from the front of the house is the support post positioned?