Domain and range function graph plz help asap

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?

Which number produces a rationale number when multiplied by 1/5

Compare the cost of the bike trips from the two companies shown.for both the cost in a linear function of the number of days which statements is true