Some Help with Pre-Calc, please?

Question

I was given this calculus packet to complete before I start the class, but I can't solve some of the problems. Can someone please help me out and show me the steps to solving them?

The link is: http://www.math.unb.ca/ready/paper.pdf

I need help with numbers:

16b

17c

21b

22b

23a

23b

35a

35c

Help with any of these is appreciated. Please respond ASAP!

Answer 1

wow that really does look hard

16b. 1/18, -1/2

17c. x > -1.

  ^ I don't see how else to solve it except to divide 0 by x+1

21b (x-2)^2 +(y-2)^2 =4

22b y= -1/3x -2/3 +5