How do I evaluate this help me please like seriously help 13−0.75w+8x when w = 12 and x = 1/2

2÷6+1/2 to the second power plus one

Joseph haydn pet store offers wide variety of leashes for dogs. the store purchases one popular type of leash from its manufacturer for $4.38 each. joseph haydn pets marks up leashes at a rate of 238% of cost. what is the retail price of the popular leash?

What is the value of x in the this question ?