exam Maths Puzzle Numerical Ability

Hello,

I need to find the circumference of this circle and round to the nearest unit.

12 m is what I have to work with ____.____ 12 m

Thank you for your help!

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exam Other Question
For the equation X-2SQRTx=0 , perform the following:
a) Solve for all values of x that satisfies the equation.

b) Graph the functions y = x and y= 2SQRTx on the same graph ( Can someone please help me understand this problem?
Given the constraints x + y(<=)90, 3x - y(>=)0, x(>=)0, y(>=)0, the minimum value for the function f(x) = 10x + 11y is
a. -90
b. 0
c. -3
d. 990
Thank you