## Problem-19

**Problem-19**

Which of these are propositions? What is the truth value of those that are propositions?

**a)** Answer this question.

**b)** What time is it?

**c)** There are no black flies in Maine.

**d)** 8+*x*=8

**e)** The moon is made of green cheese.

**f)** 2^*n*≥60

**Solution**

**a)** Answer this question.

It is not a proposition. It has no truth value.

**b)** What time is it?

It is not a proposition. It has no truth value.

**c)** There are no black flies in Maine.

It is a proposition. It has a truth value of false.

**d)** 8+*x*=8

It is not a proposition. It has no truth value.

**e)** The moon is made of green cheese.

This is a proposition that is false.

**f)** 2^*n*≥60

It is not a proposition. It has no truth value.