Question

−10+(−40)+(−90) ? hellpppppppppppppppppppppppppppppppppppppp

Answer 1

You should use PEMDAS
Parenthesis go first
Exponents
Multiplication
Division
Addition
Subtraction
In this case you would add -40 + -90 and -10
= 140

Answer 2

-140

Explanation:

-10+(-40)+(-90)

-10+1(-40)+1(-90)

-10-40-90

-90-40-10=-140