I think of a number and call it n.
I divide the number by 2 and then add 4. The answer is 21.
+4 = 21
Which option shows a correct next step?
B and C are both correct
n +8 = 42
n + 4 = 42
2 = 17

people went from manufacturing one object at a time by hand to manufacturing many objects in factories

arrange the equations with like terms in columns.

analyze the coefficients of x or y.

add the equations and solve for the remaining variable.

substitute the value into either equation and solve.

check the solution.

step-by-step explanation:

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.  

r = 78539458390583095803458309458039485093485 or just 3

step-by-step explanation: