exam Maths Puzzle Numerical Ability

Show that the function f(x)=x/x-4 is a one to one function

Find the inverse of the function

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exam Other Question

x^2 + 9x + 20 =(x + 1)(x + 20)
Is this right? D is between E and F. Find ED given EF=15 and DF=3?

M is between L and N. Us e the segment addition postulate to solve for x AND find the length of each segment
LM=3x+8
MN=2x+