I need help with solving questions relating to rational Functions, please. I'm having trouble understanding it.

B. Determine the equation in the form of f(x) = for a rational function that passes through the points A(2, 0) and B(0, - 1/2), and has a vertical asymptote x= -1/3, a horizontal asymptote of y = 4/3 The temperature, T(t), in a food processing plant's freezer after a power failure can be modelled by the function : T(t) = # -15, where t is the time, in hours after a power failure occurs. a. How long would it take the temperature to reach at least zero? b. A computer monitors the temperature after a power failure and is set to start up a power generator when the temperature reaches -5"C . How long would it take for this to happen