book Maths Puzzle Numerical Ability

please help me answer the question: Find the distance between the points (2,5)and (-4,1)

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book Other Question

Jenny has 175 coins in a jar. They consist of nickels and dimes only. The total value of the 175 coins is $11.90. How many nickels and dimes are there in Jenny's jar? Express the following product of powers of x as a single power of x :

x �x^4 � x^2