Find the cube of 9 to the 3 power

Find the measures of the complement and the supplement of each angle, m

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?

How do i do this activity, is appreciated