The first humans adapted and modified their environment, by manipulating soils and rich silt form the irrigation of the river valley. This allowed for greater use of agriculture which helped the population sizes increase and eventually evolved into a surplus. The humans began to domesticate animals and use them for work. All these adaptation and modifications let civilization eventually grow to the society it is today.
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The answer is 29. If you look at the triangle on top of it, with the obtuse angle being 122 you can see that that triangle and DEF are the same. And because the degrees of a triangle is always 180 you can subtract 122 from 180:
180
-122
That equals 58 and because there are two sides we need to divide 58 by 2:
58/2
this equals 29 so
z = 29
:)
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