X(.50) +75 (.30) + 60 (.20) = 80. solve for x

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?

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

What is the average diastolic blood pressure for adults