Identify the variable in the expression b+12

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?

Which table represents points on the graph of h(x) = 3√-x+2?

The quotient of 15 and a number is 1 over 3 written as an equation