exam Maths Puzzle Numerical Ability

am trying to help my 9th grader with algebra....the problem is: 8=x/5

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Find the perimeter of a square QRST if two of the adjacent vertices are Q(6,7) and R(-3,4). Round your final answer to the nearest tenth. The gravitational force between two objects varies inversely as the square of the distance between the objects. If a force of 25 pounds results from two objects that are 6 miles apart, how much force results from two objects that are 15 miles apart?