The contrapositive of $(p\vee q)\to r$ is

Which of the following is inverse of the proposition: "If a number is a prime, then it is odd.

Illustrate the use of all connectives and the modified 'not' in five separate examples of propositions.

Try to construct an example of a proposition involving all connectives and also the modifier 'not'.

Following sentence is proposition or not? Write with reasons:

$2<5$

Following sentence is proposition or not? Write with reasons:

Is $9<3$ ?

Following sentence is proposition or not? Write with reason:

$x$ is greater than $100$.