exam Maths Puzzle Numerical Ability

Find the length x. Express your answer in simplified radical form.
51 ft, x, 45 ft

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My questions is what is the answer to :

If f(x) = -2x + 7, what is f(x+3)?

Thank you for your time... If the graph of y=2^x is transformed to y=3(2)^(-1/4x-1) +1, what are the coordinates of the new focal point????I think the answer is (-4,4) but I do not fully understand, I'd appr