What is the mass number of an atom thy contains 42 protons, 42 elections, and 53 neutrons

The mass number of an atom that contains 42protons and 42 electrons with 53 neutrons is calculated is the mass number= numbers of protons + number of electrons

42+53=95 

There is sand and mud

Answer:

9.9 years

step-by-step explanation:

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.