HELP ME PLEASE

How many kilometers are equal to 5 miles? use 1 mile ≈ 1.61 kilometers. !

Pls the last one and it has to be like number 6

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?