Abranch of mathematics that uses variables is called?

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.

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)