What is the residual value for when x = 6?

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?

Use composition to determine if (x) or h(x) is the inverse of f(x) for the limited domain x2-1.

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a,b and c integers and a> 1