Help and explain pls and thankyou

Two blends of tea are mixed to make a blend that will be sold at the fair. black tea sells for $2.20 per pound and orange pekoe tea sells for $3.00 per pound. how much of each should be used to obtain a 4lb blend selling for $2.50 per pound?

Find the maximum value of p= 4x + 5y subject to the following constraints :

Each side length of the hexagons is 1, what’s the area of abc