The points (-8, -1) and (2 ,4) are the endpoints of a diameter of a circle. find the length of the radius of the circle.

x = x2 - x1 = -8 -2 = -10

y = y2 - y1 = -1 -4 = -5

diameter = (x^2 + y^2)^1/2 = (100 + 25)^1/2 = 11.18

radius = 11.18 / 2 = 5.59 or 1/2 the diameter.

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i'm assuming that it's c.)   volcanoes built the mountains and earthquakes tore them down.

answer:

idk

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