When evaluating expressions with negative numbers that involve more than one mathematical operation you should follow the usual BIMDAS convention, as well as keeping in mind the rules for negative numbers

### Solutions

1. Simplify the following expressions involving addition and/or subtraction and negative numbers:

a. |
**10 - (4 – 5)** |
= 10 – (-1) = 10 + 1 = 11 |

b. |
**10 – (4 + 5)** |
= 10 – 9 = 1 |

c. |
**10(4 – 5)** |
= 10(-1) = -10 |

d. |
**-10(4 – 5)** |
= -10(-1) = 10 |