exam Maths Puzzle Numerical Ability

Suppose it takes 3 days for a space vehicle to travel from earth to the moon. About how long would it take the same vehicle traveling at the same speed to reach Mercury. Moon-240,

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Can you please help me to write an equation for a direct variation with a graph that passes through these points: (9, -1) I need help solving negative pow2ere problems like:
1) 24x^-1y 2)-(2a^-1b^-3)^-2 3)-(-3xy^-3)^-2 4)(2ab^-1)-2
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