HELP PLS THIS IS DUE SOON-BTW its 7th GRADE MATH

What is the y intercept of f(x)=(1/2)^x?

Which value of m will create a system of parallel lines with no solution? y = mx - 6 8x - 4y = 12

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?