A biologist studied the populations of white-sided jackrabbits and black-tailed jackrabbits over a 5-year period. The biologist modeled the populations, in thousands, with the following polynomials where x is time, in years.

white-sided jackrabbits: 5.5x² – 9.2x + 6.9
black-tailed jackrabbits: 5.5x² + 9.9x + 1.3

What polynomial models the total number of white-sided and black-tailed jackrabbits?

11x² + 0.7x + 8.2

11x² – 0.7x + 8.2

11x² – 0.7x – 8.2

–11x² + 0.7x – 8.2

Question

A biologist studied the populations of white-sided jackrabbits and black-tailed jackrabbits over a 5-year period. The biologist modeled the populations, in thousands, with the following polynomials where x is time, in years.

white-sided jackrabbits: 5.5x² – 9.2x + 6.9
black-tailed jackrabbits:  5.5x² + 9.9x + 1.3

What polynomial models the total number of white-sided and black-tailed jackrabbits? 

11x² + 0.7x + 8.2

11x² – 0.7x + 8.2

11x² – 0.7x – 8.2

–11x² +  0.7x – 8.2

anonymous · Answer

|dw:1330116124590:dw|
add the two equations together

rulnick · Answer

No, it's 11x^2+0.7x+8.2.  Note the two + signs.

anonymous · Answer

|dw:1330129234200:dw|