Which of the following sentences are statements? Justify your answer:
(i) there are 40 days in a month.
(ii) the sum of 7 and 10 is 17.
(iii) the diagonals of a rectangle are equal.
(iv) the heat prouduced from the fire.

Explanation

(i) no month has 40 days, so the given sentences is false and therefore it is a statement.
(ii) the given sentence is true, therefore it is a statement.
(iii) the diagonals of envery rectangle are equal, so it is a true sentence and therefore it is a statement.
(iv) the heat always produced by the fire, so the sentence is true, therefore it is a statement.