book Maths Puzzle Numerical Ability

What does the following mean?

XIX 19

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book Other Question

Could someone help me please with this problem?
I am having a meltdown with polynomials, LCDs and division.
I am supposed to find the LCD, convert into an equivalent rational exp Hi, I am having trouble wiht graphing a rational equation like,

x^2 - 3x/x - 2