Acomputer valued at $6500 depreciates at the rate of 14.3% per year. find the value of the computer after 3 years

Solve for x and select the correct answer

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?

Would greatly appreciate these 3 answers