exam Maths Puzzle Numerical Ability

so my question is:

Calculate the area in metric units:
An opening of a blood vessel that is 3 mm in diameter.

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exam Other Question

Could you please explain to me "How do you interpret the slope and y-intercept in a real world example" and include details please.

I will truly be appreciated.
Thank you. If the probablility of an event is .857, what is the probability that the event will not occur?