book Maths Puzzle Numerical Ability

Question - How do I go about solving this problem??

The numerical value of eight more than the difference of 12 and 9 is 3.

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Please help, we are lost again, and specially on doing the graph. There is no book for this question, it is from the teacher. Thank you in advance for any and all help.

2) The v Calculate the sum of all even positive integers from 2 to 4000.