Can angles be named with two letters?

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?

Solve the system of equations y= 3/2 - 1, -x+ y =-3

Find the unit rate for: 75% high-fiber chimp food to 25% high -protein chimp food.