for 5. i ended up with (x (7x^3 -5x^2-37x-35))/(x^4+5x^2-6) = 0..but that doesn't seem right
move the right fraction to the other side and cross-multiply ... you should get after simplifying. you'll also get two nice solutions.
in 14 and 15 i don't know what the triangles mean
change to and work them.
I have never graphed functions with restrictions like in 16 and 17
#16 is a difference quotient ... note that #17 are piecewise functions ... graph each piece for the x-values given. you should have graphed these in precalculus.
i think 13a. doesn't have a domain
... that is incorrect. ... what values of x can you legally use?
i don't know what the symbols in 41-43 stand for
those are just piecewise functions like in #17 ... the bold garbage symbols are just that, garbage (big typos).