Boosting this so more people can see!!
-7 because when it’s +(-) it’s always the same as the outside sign
-4 same thing explained above
-4
hope this helps
Answer:
6
Step-by-step explanation:
I like to line up my addition problems vertically
2 1/5
+ 3 4/5
--------------
5 5/5
but 5/5 = 1
5 + 1
6
The answer is: cosV=39/89=0,43
D means common difference which is the last term minus second last term .
and u can use this formula only if there is a common difference.