Which is the place value of the 9 in the number 9,231,478?

What is the solution to the system of the equations? x = y - 3 x + 3y = 13

Which statement best describes the polynomial

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?