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
I could use some help in understanding this problem from a homework sheet. If f(x)=x^2+2x,find f(-1). thank you. I need to see how this was solved: x/x-1 - 2/1-x^2 = 8/x+1

Thank you