Force, Momentum and Time is being related by Newton's second law.
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D.) high level of urbanization
This is because urbanization is a key element.
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RS + ST = RT
(5x-2) + (3x + 2) = 48
5x + 3x - 2 +2 = 48
8x = 48
8x/8 = 48/8
x = 6
RS = 5x - 2
= 5(6) - 2
= 30 -2
= 28
ST = 3x + 2
= 3(6) + 2
= 18 + 2
= 20