Please answer question 19, 20, and 21

Question 19 B0/1 pt Find all zeros of f(x) = x3 + 5x2 + +5. Enter the zeros separated by commas. Check Answer Question 20 B0/1 pt Determine the zeros and the vertical intercept of the polynomial function: f(x) = 3(x+5)*(x+6)(x + 4) The zero(s) of the is/are The horizontal intercept(s) is/are The vertical interceptis Check Answer Question 21 B0/1 pt Find all possible rational zeros of 2% + 6x +7 +22-- 3.1 - 6. Write all answers as reduced fractions, and use "+" to represent the symbol. Check Answer