What is the name of the positively charged particle in the center of an atom?
a. electron
b. neutron
c. nucleus
d. proton

The correct answer is D. Protons

The nucleus (center) of the atom contains the protons (positively charged) .

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.

it's not c. i took the quiz and got it wrong. so my best guess is b.

have a great day, and hope this .