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.

True or false

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book Other Question

Find a1 of arithmetic sequence from given information.
a7=-45 a15=-77
Please help me to solve this equation below
If f(4)=0 and f(6)=6,which of the following could represent f(x)?
A. 2:3x-4
B. x+2
C. x-4
D. 3:2x+6
E. 3X-12