The half-life of cesium-137 is 30 years. Suppose we have a 30 mg sample.
(a) Find the mass that remains after t years.
(b) How much of the sample remains after 20 years? (Round your answer to two decimal places.)

if you use photomath right away it will give you the answer not like this app that you have to wait for people.

well there are two answers for that.

1: you need 120 ones then that will equal up to 120.

2: you could also do one 100 and 2 tens.

those are the answers that i have thought of.

the factors of 24 are 1, 2, 3, 4, 6, 8, 12 and 24. hope this ! mark brainliest! you v much! : )