The half life of radium is 1600 years. (a) find the rate of decay
(b) find the function that models the decay of 30 mg sample of the substance
(c)find the function that models the decay of m0 mg sample of the substance

One-third of the people from country a claim that they are from country b, and the rest admit they are from country a. one-fourth of the people from country claim that they are from country a, and the rest admit they are from country b. in a combined census of the two countries, one-half of the total claimed to be from a. what is the ratio of the populations of country a to that of country b.

The chs baseball team was on the field and the batter popped the ball up. the equation b(t)=80t-16•16+3.5 represents the height of the ball above the ground in feet as a function of time in seconds. how long will the catcher have to get in position to catch the ball before it hits the ground? round to the nearest second

Solve the inequaliy: (x^2+2)(x−2)^2(6−2x)> 0