Change the digit 5 to zero in each number. Show your operation.

a) To change the 5 in 4 854 (which is in the tens place) to zero, subtract 50.

$$4854 - 50 = \boxed{4804}$$

b) To change the 5 in 3 521 (which is in the hundreds place) to zero, subtract 500.

$$3521 - 500 = \boxed{3021}$$

c) To change the 5 in 2 005 (which is in the units place) to zero, subtract 5.

$$2005 - 5 = \boxed{2000}$$

d) To change the 5 in 6 050 (which is in the tens place) to zero, subtract 50.

$$6050 - 50 = \boxed{6000}$$

e) To change the 5 in 5 000 (which is in the thousands place) to zero, subtract 5000.

$$5000 - 5000 = \boxed{0}$$

a) Given: 4789 is odd.

b) Let's choose 2134. Since it ends in 4, it is even.

c) Let's choose 3570. Since it ends in 0, it is even.

d) Let's choose 4001. Since it ends in 1, it is odd.

e) Let's choose 2999. Since it ends in 9, it is odd.

The numbers from Question 5 are: $4789, 2134, 3570, 4001, 2999$.
Ordering them from biggest to smallest:

$$\boxed{4789, 4001, 3570, 2999, 2134}$$