exam Maths Puzzle Numerical Ability

Solving an absolute value equation. |5x| = 13

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exam Other Question

an airplane over the pacific sights an atoll at a 5 degree angle of depression. If the plane is 450 meters above water, how many kilometers is it from a point 450 meters above the atoll. Find the reciprocal of (-1/5)(15).
Can someone help me with this one? the -1/5 fraction are supposed to be in the "longer type" of parenthisis. I just do not no how to find the r