Question

which is the last number i am confused? plz help

Answer 1

Of course, the number is 7.

You have its square and its cube.

To find x from its square: √49 = 7

To find x from its cube: cubic root of 343 = 7

You made a mistake in the first column. The cubic root of 8000 is 20. The square of 20 is 400