I need help with these??

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.

ask your friends for what they got then copy it down if you don't have any friends which is fine than google it or pay the teacher

her next move would be to use agarose gel electrophoresis to separate the dna molecules of varying length and create a dna fingerprint.