2a.int n = 1;
while (n <= max) {
    System.out.println(n);
    n++;
}
int total = 25;
2b.int number = 1;
while (number <= (total / 2)) {
    total = total - number;
    System.out.println(total + " " + number);
    number++;
}
2c.int i = 1;
while (i <= 2) {
    int j = 1;
    while (j <= 3) {
        int k = 1;
        while (k <= 4) {
            System.out.print("*");
            k++;
        }
        System.out.print("!");
        j++;
    }
    System.out.println();
    i++;
}
2d.int number = 4;
int count = 1;
while (count <= number) {
    System.out.println(number);
    number = number / 2;
    count++;
}
4.
19 , 0
21, 1
3 , 4
5 , 3
1 , 6
6.
Random rand = new Random();
int num = rand.nextInt(11);
8.
1 11 21 31 41 51 61 71 81 91
10.
public static int zeroD(int number) {
    int count = 0;
    do {
        if (number % 10 == 0) {
            count++;
        }
        number = number / 10;
    } while (number > 0);
    return count;
}
12.
public static void printL(String text) {
    if (text.length() > 0) {
        System.out.print(text.charAt(0));
        for (int i = 1; i < text.length(); i++) {
            System.out.print("-" + text.charAt(i));
        }
    }
14.
true
true
false
true
true
false
false
true
true
true
true
false
16.
After it it goes finds a factor once it will go to prime is flase however when it runs it again prime will be reset to true.
public static boolean isPrime(int n) {
    boolean prime = true;
    for (int i = 2; i < n; i++) {
        if (n % i == 0) {
            prime = false;
        }
    }
    return prime;
}
18.
public static boolean startEndSame(String str) {
    return str.charAt(0) == str.charAt(str.length() - 1);
}
20.
3,1,2,6,15
22.
!b
(x <= y) || (y <= z)
(x != y) && (x > z)
(x % 2 == 0) || !b
(x / 2 != 13) && !b && (z * 3 != 96)
(z >= x) || (z <= y && x < y)