book Maths Puzzle Numerical Ability

A top spins 200 revolutions/minute. Find the angular velocity in radians/second.

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book Other Question

when i am trying to get a line that is parallel to a line that is going through a set of given points, when do i use the rule that tells me to use opposite sign and flip the number upside down in my equation? "state the values of x, if any, for which each expression does not name a real number."
#28. radical:x+1 (I don't know how to make a radical sign on the computer)

I'm totally c