exam Maths Puzzle Numerical Ability

What is the circumference of a circle with a radius of 4.1 m? Round to the nearest tenth.Use pi=3.14





Thanks,
Amanda

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exam Other Question
In a Math contest, Team B earned 3 points less than Team C. Team A garnered 6 points more than Team B. What is the difference between the highest and lowest score? I need the answers and steps for these five. Even though this is my first question of the day I know it counts as 5 so I will only ask one other today
Thanks
1.(2a5)3
2.(-3xy3)4
3. (5a3b4)2
4.(-mn8)3
5. (-2x2y)3 * (5xy3)2