For an angle θ with the point (15, −8) on its terminating side, what is the value of cosine?

The value of cosθ is

Step-by-step explanation:

It is given that  an angle θ with the point (15, −8) on its terminating side.

Here x=adjacent side=15 units and y=opposite side =-8 units,

Using pythagoras theorem,

Cosine is defined as

Therefore the value of cosθ is .

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.  

x-3y=4

step-by-step e