Solution:
The given Polynomial is :

By Rational Root theorem the of Zeroes of the Polynopmial are:

But , 
So, no root of this polynomial is real.
Therefore, All the four roots of Polynomial are imaginary.
So, we can't say whether the number k=2, is an upper or lower bound of the polynomial
.
Y=-9x because y=mx+b is the formula so plug in the slope, m(-9) and the x-intercept, x(0)
6 times 20 equals 120 and equals 26 when added together
All answers are the same, 9, but only the first choice follows a correct simplification.