Possibly you are confused because there is unnecessary (or contradictory) information given. Please show your work, and tell us where you are stuck and why.
Why did you post such incompetently taken image?
The question as written is all wrong. If \(f(x) = \int_4^x {(2t - 2)dt} \) then \(f(4)=0\text{ NOT }6\)
However \(f'(4)=6~,~f(7)=27~\&~f'(7)=12\)
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