Why do we have to learn about genetics

because it's helpful to know how you are when you're born and stuff also if you might have hereditary diseases, or if you plan on having children in the future, or of you want to be a doctor, countless reasons that it could come in handy.

Explanation:

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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.