Given cs = 2x, sb = 4x + 1, cr = 6, and ra = 13.5. what must the value of x be in order to prove sr || ba? 2 3 4 5 (if someone can tell me how to put a photo in that would be great as well)

Boris needs to buy plastic spoons. brand a has a box 42 spoons for $2.37. brand b has a box of 72 spoons for $3.57. find the unit price for each brand. then state which brand is the better buy based on the unit price. round your answer to the nearest cent.