Which is the best answer to this question

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?

Find the value of the variable and the length of each secant segment.

Factor the polynomial by its greatest common monomial factor.