At Market A , 1-lb packages of rice are sold for $2. At Market B rice is sold in bulk for $2/lb. For each Market write a function describing the cost of buying rice in terms of the weight. How are domains of the 2 functions different?

Becca wants to mix fruit juice and soda to make a punch. she can buy fruit juice for $3 a gallon and soda for $4 a gallon. if she wants to make 28 gallons of punch at a cost of $3.25 a gallon, how many gallons of fruit juice and how many gallons of soda should she buy?