Answer:
70
Please vote for Brainliest and I hope this helps!
Step-by-step explanation:
first and foremost you have positive and minus 1 which will cancel out to zero
then we're left with
-1 X 30
1 X -30
-2 X 15
2 X -15
-3 X 10
3 X -10
-4 X 7.5
4 X -7.5
-5 X 6
5 X -6
Hope this helps! ;)