23.
If you have a density of 2.5 g/mL and a mass of 5 g, what is the volume?

2 ml

2 cm³

d = m/V => V = m/d

V = 5g/2.5g/ml

= 2 ml

= 2 cm³

do you have a picture?

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.