book Maths Puzzle Numerical Ability

how do you do 3/2 x/-27 and 9=t-8/4

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Please show work</b>

Find the distance between the points (2, -2) and (-4, 3)

Thank you! x varies directly as the square of s, and inversely as t. How does x change when s is doubled? When both s and t are doubled, how does x change?