Rutherford’s theory was identified by

beam of particles and their scattering after hitting on gold foil.

Explanation:

Rutherford’s theory was identified by beam of particles. The nucleus is present in the center of the atom. The nucleus consist of protons and neutrons. The mass of atom is majorly due to protons and neutrons. The nucleus is surrounded by the electrons.

The results were observed by placing the magnet after beam of electrons.

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.

mammal

explanation: