For what value of x is the rational expression below equal to zero? x-4/(x+5)(x-1) A. 4 B. 1 C.-5 D. 4

Situation: find the age of the skull to the nearest year, enter the correct answer. a hiker in africa discovers a skull that contains 32% of its original amount of c- 14. done n = noekt 00000 no = inital amount of c-14 (at time t = 0) n = amount of c-14 at time t k = 0.0001 t = time, in years