If x/y=5/8 which of the following must be true?

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?

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

Answer for 10 points show work you guys in advanced < 3