Which of the following are propositions? Give the truth value of each proposition.


(a) What time is dinner?


(b) It is not the case that π is not a rational number.


(c) x / 2 is a rational number.


(d) 2x + 3y is a real number.


(e) Either π is rational and 17 is a prime, or 7 < 13 and 81 is a perfect square.


(f) Either 2 is rational and π is irrational, or 2π is rational.


(g) Either 5π is rational and 4.9 is rational, or there are exactly four primes less than 10.


(h) −3.7 is rational, and either 3π < 10 or 3π > 15.


(i) It is not the case that 39 is prime, or that 64 is a power of 2.


(j) There are more than three false statements in this book, and this statement is one of them.