exam Maths Puzzle Numerical Ability

3 to the -x power is equal to (1/3) to the x power....how do i prove this mathematically?

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exam Other Question

Suppose you are offered two jobs. One pays $30,000 the first year with annual raises of $2,000. The second offers a starting salary of $27,000 and raises of 8% each year. Over a te what is the law of sines