What is 9+(-18)
pls explain

-9

9 is positive and 18 is negative, so since 18 is negative, you subtract 18 from 9 and get -9.

To check your answer, on a number line, plot 9, and move 18 to the left.

false

step-by-step explanation:

the reason i say this is because for a certain length of sides you can pick any two and the length is wither equal or greater than the third side and in this case it's not.

3 + 5 = 8

8 is smaller than 9 which is the third side.

hope this : )