exam Maths Puzzle Numerical Ability

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+

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

Find the inverse of the function

Thank you tutors u+12/-4=5

"u+12" is the numerator and "-4" is the denominator. Thanks for the help...