What's the different between "relation" ,"relationship" ,"relative" in theses sentences ? 1.The study found a strong relationship between a lack of friends .....

2.Whether you think the price is high is relative to the amount of ....

3.I am writing in relation to the job advertising ....

I can't understand the different between these words in these sentences ?

for example why it uses relative in number 2 and dos not use related?!?

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What's the meaning of "make a walk"?