exam Maths Puzzle Numerical Ability

What symbols and/or abbrevations are used to denote the set of real numbers and the subsets of real numbers?

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exam Other Question

A ramp on a freeway is circular in shape. If the radius is 54 meters and the central angle is 210 degrees, what is the length of the ramp? Give answer to 2 decimal places. Having trouble with cost functions in general. My problem is below.
Assume each of the following can be expressed as a cost function. find the appropriate cost function in each c