Help me please 100 points

F(x) = (x^2 + 3x − 4) and g (x) = (x+4) find f/g and state the domain.

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?

∆red ≅ ∆ by rule will give brainiest if possible