The radioactive substance cesium-137 has a half-life of 30 years. the amount at (in grams) of a sample of cesium-137 remaining after t years is given by the following exponential function.
at(t)=458(1/2)^(t/30)
find the amount of the sample remaining after 20 years and after 50 years. round your answers to the nearest gram as necessary.

The amount of sample left after 20 years is 288.522 g and after 50 years is 144.26 g

Explanation:

We are given a function that calculates the amount of sample remaining after 't' years, which is:

For t = 20 years

Putting values in above equation:

Hence, the amount of sample left after 20 years is 288.522 g

For t = 50 years

Putting values in above equation:

Hence, the amount of sample left after 50 years is 144.26 g

Firstly, the water in the dams hold gravitational potential energy as they are above ground level. the gravitational potential energy is then transferred to kinetic energy as it falls, spinning the turbinethe turbine then spins the generator, which is a large magnet surrounded by metal coils. by doing this, the generator generates electricity. in this action, the energy transfer taken place is kinetic to electric energy

Sorry i dont understand the question can you rephase it?