Absolute Value

First, calculate $-3\times 7$, which is -21. The absolute value of -21 is 21. Then, $21+5=26$.

The absolute value of a negative number is the number without its negative sign. So, $|-17|=17$.

Start by finding the absolute values: $|-12|=12$ and $|-3-7|=|-10|=10$. Then calculate $12-10=2$.

Both numbers are negative, so you add their absolute values: $70+85=155$, then apply the negative sign to get -155.

Subtract the smaller absolute value from the larger: $115-80=35$. Since 115 is larger and negative, the result is -35.

First calculate $|-4\times 5|=|-20|=20$. Then $|-8+3|=|-5|=5$, and $|6-9|=|-3|=3$. Substitute: $20-5+3=18$.