So 30 and 2.5 would be subtracted and added by whatever value. Then divided hope that helped
The explanation is here. the rest of the questions must be do by yourself.
1+3=4
A counterexample is an a example that proves the statement false.
1+3 are not even numbers but they equal an even one, so it just proved the statement wrong.
Answer: The answer is your bad, you shouldnt be "answering" questions with " sorry i need points"