exam Maths Puzzle Numerical Ability

find the circumference of a circle if the area is 400 pie m squared?

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Ok I am having a heck of a time trying to figure theses out. Here is an example of one, can anyone give me any tips on hints that I could ask myself as to where to start?

Graph an equation of the form y = mx + b

y = 5x - 4

Thank you How would i write an equation for each translation of y= -[x], if i need to move 2 units up?? would it say y= -[x] + 2?? would 3/2 down be y= -[x]-3/2???