Factor completely.

3x^2 −147=

Step-by-step explanation:

To factor this, you must first take out the GCF (Greatest Common Factor), that and -147 both have. The terms only have 3 in common, which can be divided with

However, we're still not done since 49 is a perfect square and can be split into 2, like so:

If you're unsure about the final answer, you can multiply it all together to see if you got the original expression.

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.  

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.