How do you answer these questions?

If f is defined piecewise for a * 0 by O 1. (-00, -2) U (-2,00) 5+ x, x 2. 2 0 4. (-00, - 2) U ( -2, 0) U (0, 00) determine all values of a at which O 5. (-00, 0) U (0, 2) U (2, 00) lim f(x) x-+ a 0 6. ( -00, - 2) U (- 2, 2) U (2, 00 ) exists, expressing your answer in interval no- tation. 0 7. (-00, 0) U (0, 00)If the graph of f is O 1. limit = -3 ..i.. .... O 2. limit = -2 6 O 3. limit = 2 2+ O 4. limit = -4 2 .8. 10 12 5. limit = 3 6. limit does not exist determine if x- 7 lim |x - 7 f(x) I-+7 exists, and if it does, find its value.Use this graph to determine the value of lim f(') 2}6 when a is a. point in (7, 7) at which f has a removable discontinuity. Let P(x) and Q(x) be polynomials. Deter- mine O 1. limit = -oo P(x) lim T-+ 00 Q(x) O 2. limit = 0 when P has degree 3 and Q has degree 8. 3. limit = 3 4. not enough information given 5. limit = oo O 6. limit = 8If f is a differentiable function, then f'(a) is given by which of the following without 1. A only further restriction on f? O 2. B only A. lim flath) - f(a) O 3. A, B, and C h-+0 h 4. A and B only lim f(x) - f(a) B. 5. A and C only x - a f(xth) - f(x) C. lim h