The half-life of a certain isotope of strontium is 25 years. How much of this strontium will remain after 100 years if the initial amount is
4.0 g?

Jayne is studying urban planning and finds that her town is decreasing in population by 3% each year. the population of her town is changing by a constant rate.true or false?

Could someone me with this question i’ve been stuck on it for 20 minutes

In the diagram, a building cast a 35-ft shadow and a flagpole casts an 8-ft shadow. if the the flagpole is 18 ft tall, how tall is the building? round the the nearest tenth.