The width of a rectangle measures (7a + 10b) centimeters, and its length measures (9a + 5b) centimeters. Which expression represents the
perimeter, in centimeters, of the rectangle?

32a + 10 + 10

32a + 30

30b + 32a

16a + 15

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The answer is below

width = (7a + 10b) cm

length = (9a + 5b) cm

Perimeter = 2(width + length)

= 2(7a+10b) + (9a+5b)

= 2(7a+10b + 9a+5b)

= 2(16a+15b)

= (32a+30b) cm

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.  

the answer will be b x² +x-1

step-by-step explanation: