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1. Solving an inquality

Homework Statement So this is the question |x-1|+|x-2|>1 Homework Equations N/A The Attempt at a Solution I tried it, the solution seems right, but i don't know if my approach is correct.
2. Finding the domain for inequality

Homework Statement The problem is: for all 0≤a≤1 so i need to find the domain Homework Equations N/A The Attempt at a Solution I tried it like this: yet my solution is wrong,i am not so sure why. wolfram gives me this;
3. Solving |x-1|*|x+1|=0

Homework Statement find all the numbers x for which |x-1|*|x+1|=0 Homework Equations The Attempt at a Solution |x-1|*|x+1|=0 |x-1|=0 or |x+1|=0 x-1=0 or x+1=0 x=1 or x=-1 but I think there's a flaw some in my attempt solution...or the whole thing is a flaw.. any help...
4. Help with Michael Spivak's fourth edition calculus book

Hi, I am having difficulties doing the problems in Michael Spivak's fourth edition calculus book. I am not sure how to approach the problems. I am able to understand the contents chapters but when I start to do the chapter problems, I have no idea how to do them.Any advice will be...
5. Post for helm under learning section why is this?

hello, i came across this PF during search on calculus registered this account... but i can not post for helm under learning section why is this?