How is this answer correct?
2. A biologist studied the populations of black bear and brown bears over a 10 year period. The biologist modeled the populations, in thousands, with the following polynomials where X is time in years. What polynomial models the total number of brown and black bears?
Black bears: 2.3x^2 – 5.6x + 2.3
Brown bears: 2.4x^2 + 7.2x + 0.97
A. [x] 4.7x^2 + 1.6x + 3.27
B. 4.7x^2 – 1.6x – 3.37
C. 4.7x^2 + 1.6x – 3.37
D. 4.7x^2 – 1.6x + 3.37

Question

How is this answer correct?
2.     A biologist studied the populations of black bear and brown bears over a 10 year period. The biologist modeled the populations, in thousands, with the following polynomials where X is time in years. What polynomial models the total number of brown and black bears?
Black bears: 2.3x^2 – 5.6x + 2.3
Brown bears: 2.4x^2 + 7.2x + 0.97
A.	[x] 4.7x^2 + 1.6x + 3.27
B.	4.7x^2 – 1.6x – 3.37
C.	4.7x^2 + 1.6x – 3.37
D.	4.7x^2 – 1.6x + 3.37

baru · Answer

the answer is just the sum of the two polynomials
2.3x^2 +2.4x^2=4.7x^2

-5.6x+7.2x= 1.6x

2.3+0.97=3.27