Java Help

I got a few questions:

  1. What is the general purpose of conditionals? How do they enhance the creation of decisional outcomes?
  2. Suppose we wanted to establish a program that analyzes and makes a decision about the following topic:
    Purchase a burger or a slice of pizza based whether the price of each item was above $2.00.
    Create a proram that demonstrates this decision.
  3. Convert the following to its extended assignment form
    x = x + 2
    y = y * 4
    z = z - 8
    a = b + 1
    x = x / 2
    a = a % 6
  4. Convert the following to its increment or decrement form
    int q; q = q + 1 result is: ??
    double r; r = r - 1.0 result is: ??
  5. Which math method would be the best to use in the following situations:
    Identify the largest number in the set: x=15, y=12, z=22
    Identify the smallest number in the set: 20,15,35
    Cube 5
    Square when x = 4.0
    Thanks!