The standard equation of a circle with center (h, k) and a vertical axis of symmetry is (x - h)2 + (y - k)2 = r2. A circle's center is (3, −2) and the radius is 12. Which equation models the circle? A)(x − 3)2 + (y + 2)2 = 12
B)(x + 3)2 + (y − 2)2 = 12
C)(x − 3)2 + (y + 2)2 = 144
D)(x + 3)2 + (y − 2)2 = 144

answer: expected value of x = 1.0

step-by-step explanation:

p(x=0) = 0.25

p(x=1) = 0.50

p(x=2) = 0.25

expected value for x = 0×0.25 + 1×0.5 + 2×0.25 = 1.0

the answer is; biodiversity resulting from few ancestors

adaptive radiation occurs when a population is subjected to a large natural environment with spatial ecological variations. the parts of the population in the different ecologies begin to adapt to their local environments. due to non-random mating across the large populations, this causes the different populations from the large population to speciate within their local environments. they, therefore, diverge to different species sharing a common ancestor.  

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