Someone help me with these por favor

What expression is equivalent to 42x-56y

What value of x is in the solution set of 4x - 12 s 16 + 8x? -10 -9 -8 -7

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.