Plz help i beg i will give 13 points and brainlist

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 anwers for 9+2x=5x-3-x

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account