For the following polynomial: −x^4 + x^3 + 7x^2 − x − 6

Part A) How many zeroes will this function have ?
Part B) Use the Rule of Signs to determine the possible number of positive zeroes, negative zeroes and complex zeroes
Part C) Use the root theorem to determine what the possible zeroes are for this polynomial.
Part D) Use synthetic division and other tools to find the zeroes
PLEASE HELP AND SHOW WORK!! 25 POINTS