Hurry it's
which is the intersection of the sets p = {1, 2, 3, 4}, q = {4, 5, 6, 7}, and r = {7, 8, 9, 10}?

{7}

null set

{4, 7}

{4}

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.