$$\(19 a=\frac{p-q}{t}\)$$ $$\(p=8.4\)$$ correct to 2 significant figures. $$\(q=6.3\)$$ correct to 2 significant figures. $$\(t=0.27\)$$ correct to 2 significant figures. Work out the upper bound for the value of $$\(a\)$$. Show your working clearly. Give your answer correct to 1 decimal place.

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