Answer:
-26
Step-by-step explanation:
Sum is the addition of two or more integers. The sum of negative and positive integers must always consider the sign before a number for the given numbers, we shall add them one by one as follows
-18+12=-6
-6+-27=-33
-33+-9=-42
-42+16=-26
Therefore, the sum is -26 which is not among the options given although this is the right answer
[tex]\boxed {-26}[/tex]
