A designer builds a model bicycle the finished model is exactly the same shape as the original but smaller the scale factor is 2:15 (A) volume
(B) surface area
(C) volume

Initially 100 milligrams of a radioactive substance was present. after 6 hours the mass had decreased by 4%. if the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. (round your answer to one decimal place.)

Suppose that in 2008 , 840,800 citizens died of a certain disease assuming the population of teh country is 399 miliion, what is the mortality rate in units of deaths per 100,000 people?

I’m really confused and need your assist me with this question i’ve never been taught