Be a sweetie and help a home girl out <3

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?

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

Write an inequality for this description. - one fourth of the opposite of the difference of five and a number is less than twenty.