Wich is bigger 3 pounds or 50 ounces

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

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?

Rewrite the expression in z to the n power. the expression i was given is: 1 over z to the negative 1 half power.