Which of the following lines is a cliché? 1. if music be the food of love, play on. 2. the moving finger writes; and, having writ,/moves on 3. he moves at the speed of light, 4. a thing of beauty is a joy forever,

The line that is a cliché is "A thing of beauty is a joy forever".

The definition of cliché is a phrase or ides that has its importance or meaning based on its extreme overexposure. The expression "A thing of beauty is a joy forever" can be applied at any area of anyone's life, therefore, it is a cliché it plain words it has been used so much that it doesn't cause as much impact as it should.

The other expressions have an important difference from this one which is the fact that we can not use them as widely as the phrase in number 4.

the guest is my guess

onto a large boat, and mark the water level that the boat sinks to. then, take the elephant out and put a bunch of marked weights onto the boat until it reaches the same water level. add up the masses of the weights to get the weight of the elephant.