book Maths Puzzle Numerical Ability

how do u find the area and circumeference of a circle with a radius of 5 meters?

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book Other Question

I have 6 digits. My hundred thousands digit is 1 less then my ones digit, 8 more than my thousands digit, twice my tens digit, and 4 times my hundreds digit. What number am I? E I need help!
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Using the index of a sequence as the domain and the value of the sequence as the range, is a sequence a function?

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