book Maths Puzzle Numerical Ability

I need to know what a "scale factor" is. (i;m in basic geometry in school) and not sure of what the scale factor means.

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book Other Question

Considering the following functions:
P=the price of each ticket, Q=the number of tickets sold, R=the total revenue from the sale of the tickets.
R = Q x P

How do you write a f What Is The Value Of The Variable "X"? -------> 4"X" + 3 = -5