+0  
 
0
45
2
avatar

Explain how to calculate 75 + 72 + 69 + 66 + ... + 21 + 18 + 15 + ... + (-69) + (-72) + (-75) without a calculator.

 Sep 7, 2022
 #1
avatar
0

literally just simplify

 Sep 7, 2022
 #2
avatar+2455 
0

All the terms cancel out. 

 

The positive 75 cancels with the negative 75; the positive 72 cancels with the negative, and so on and so forth.

 Sep 8, 2022

37 Online Users