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
.
Answer:
49.8 degrees celcius
Step-by-step explanation:
3, 6, 9, 12, 15
5, 10, 15
1/3 = 5/15
3/5 = 9/15
⭐ Please consider brainliest! ⭐
✉️ If any further questions, inbox me! ✉️
First, you have to find the LCD. The LCD of 4 and 7 is 28, so you rewrite the fraction:
7/28
4/28
Then you add them.