Answer:
77
Step-by-step explanation:
Add all the numbers up, then divide it by how many numbers there are in the set.
put them in order so it'd be 74,75,75,76,78,80,81 then add them together is 539 then divide 539 and 7 and your answer is 77
The numbers:
1, -3, 2, -9, 3, -15, 4, -21,
are not linear.
If it was linear:
4, 3, 2, 1, -3, -9, -15, -21
Communicative property is the third one second one is assositave and first one is distributive
B is the variable and A is the numerical coefficient