State whether the number in each sentence is exact or approximate.

1. The voting age is $18$ years old.

   Hint (a):

   This problem is very similar to 9-73, so refer to that problem if you are having trouble.

   Answer (a):

   Exact

2. $4^{3} = 64$

   Hint (b):

   This is a mathematical relationship. Does that make it exact or approximate?

3. The length of my pencil is $10.25$ centimeters.

   Hint (c):

   Do you think the pencil is exactly $10.25$ cm? Is it possible that it is a few millimeters shorter or longer?

   Answer (c):

   Approximate, since this is a measurement.

4. I put $2$ tablespoons of chocolate syrup on my ice cream.

   Hint (d):

   Refer to problem 9-73 for more help.