Whis is the graph of = 2cos pi x

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?

The equation respenting the left table is

Simply 8x squared + 5(7x squared- x) - 2x =