Which describes two minerals that have different arrangements of their atoms?
a.
they may have all the same physical properites.
b.
they may have different physical properties.
c.
they always have the exact same streak
d.
they always have the exact same hardness.

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.