Which motion describes molecules in a solid at extremely low temperatures? *
Moving freely and randomly in a space
Vibrating while closely packed together
Sliding around one another and colliding
Bumping together with some room to move

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Vibrating while closely packed together is the right answer

9.9 years

a = p(1 + rt) . . account balance after time t at rate r starting with principal p

3000 = 2500(1 + 0.0202t) . . filling in the given numbers

1.2 = 1 + 0.0202t . . divide by 2500

0.2 = 0.0202t . . . subtract 1

0.2/0.0202 = t ≈ 9.901

it will take about 9.9 years for the account balance to reach $3000.

satellites are frequently used to make observations of the orbit on earth