40 points please help!! I will mark brainliest! Random answers will be reported

Look at this expression. a3b3c a-3b-3c-1 which of the following is the simplest form of the expression above?

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?

What is the number 321,000,000 in scientific notation? also what is the number? ?