Question

please answer these All 3

Answer 1

answee of 18. is ( A) 1

Answer 2

Here is your answer-
1st. I dont know sorry because i think options are wrong.
2nd. (A)1
3rd.x=-2 and y=1
i.e
${ - 2}^{3} + {1}^{ 3} = - 8 + 1 \\ = - 7ans.$