exam Maths Puzzle Numerical Ability

Use the Distance Formula to decide whether PQ = QR.

P (4,-4)
Q (1,-6)
R (-1,-3)

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Please help me solve the equation and put it in standard form:
(the sqare root of 2 over 2 + the square root of two over two 'i')to the forth power A company uses the expression 0.0004x + 20 to estimate the cost in cents per mile for operating a company car and the expression 20,000 = 0.2x to estimate the value of the car in