exam Maths Puzzle Numerical Ability

Can you please help me solve the following equation?

A function gives the value of "c" as 2 x (22/7) x r. Find "c" when r =70.

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exam Other Question

How do i find the Maximum or Minimum of this equation? 8t^2+16t+113 Can someone help me graph the following problem? I am lost.

Solve the system by graphing:

3x + y = 6
3x - y = 0

Thank you,
Ashley