Trapezoid abcd has vertices at a(2,1) b(12,1) c(9,4) and d(5,4). which formula would you find out if this trapezoid is isosceles? is this an isosceles trapezoid?

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.