The height of an art is 7 feet, and Mike guessed that it was 6.33 feet. What as the percnet of his error?

Tom is making a punch that contains 80% cranberry juice and the rest ginger ale. the punch has 2 liters of ginger ale. part a: write an equation using one variable that can be used to find the total number of liters of cranberry juice and ginger ale in the punch. define the variable used in the equation and solve the equation. hint: 0.8x represents the number of liters of cranberry juice in the punch. (5 points) part b: how many liters of cranberry juice are present in the punch? show your work.

I'm confused on this could anyone me and show me what i need to do to solve it.

What is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)