book Maths Puzzle Numerical Ability

Please help me (and explain the breakdown steps alon the way please)solve this (The chart may not come through, so I'll do my best to explain it. Thank you.

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book Other Question

3/4(3t-4)=5 answer in book is 8 Find the axis of symetry (X-coordinate) and vertex of the parabola y = 6 + 6x - 1/3xSQUARED. the x of 1/3x is squared