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: 9.7x2 – 0.8x + 2.3 Black-tailed jackrabbits: -1.1x2 + 7.7x + 5.4 What polynomial models the total number of white-sided and black-tailed jackrabbits? A. -8.6x2 + 6.9x - 7.7 B. 8.6x2 - 6.9x + 7.7 C. 8.6x2 + 6.9x + 7.7 D. 8.6x2 - 6.9x – 7.7

b.my answer is b.

brainliest

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.

the angles measure to 70 degrees, 70 degrees, 20 degrees, and 20 degrees