(look at image) can i get help on this problem

What is the definition of exponential decay?

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.

Triangle knm is what is true about the sides of knm