Which group are 20% of the markers black

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.

10x − 5y + 14 = 0 whats the answer pls

Find the center of the circle that can be circumscribed about efg with e(4,4) f(4,2) g(8,2)