Need help understanding the following questions, please.

8) Find at least one point at which each function is not continuous and state which of the 3 conditions in the definition of continuity is violated at that point. a) -+x+6 x-2 sin x c) In (x2) 9. lim(2x + 1)=7. What values of x guarantee that f(x) = 2x + 1 is x-3 (a) within 1 unit of 7? (b) within 0.6 units of 7? (c) within 0.04 units of 7? State each answer in the form "If x is within units of . . ." 10) Use the Limit Principles to find the following limits, if they exist. a) lim (4x3 - 2x2 + 7x + 5) x-3 b) lim 2x3-3x3+7x+5 1-x c) lim Vx4 - 3x2 + 2x + 1