Can anyone me with this question kelsey purchase items from a wholesale website and resells them on her own website. she typically marks up her merchandise 40%. if she purchase an item for 15$, what price should she set for the item

15/x = 40/100. Cross multiply to get 1500 = 40x. Divide by 40 on both because you want to isolate the variable. The idem would originally cost $37.50. To check your answer you would substitute your equation and get 15/37.5 = 40/100. Just so you know a decimal can be in a fraction. Cross multiply to get 1500 = 1500. 

(1/x + 1)^2 + 6 (1/x + 1) +5

The answer is something i don’t know