What is the area of the trapezoid?

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?

What expression is equivalent to 1/2(2+3x-6)

Could someone with number 1 and 2