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PLease help me on this I need help, which one is it??

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?

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

Which expression is equivalent to 3^3 + 2^2?