Plss help mee answer my homework plss im begging u

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?

When turned about its axis of rotation, which shape could have created this three-dimensional object?

Which of the following expressions is equal to 2x^2+8