Protactinium-234m, a toxic radioactive metal with no known use, has a half-life of 1.17 minutes. How long does it take for a 225-milligram sample to decay to 4 milligrams.​

For what is the measure of the angle at the top of the shed? a. multiplication of areas b. squaring of areas c. addition of areas d. division of areas

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

The graph of a function f(x)=(x+2)(x-4). which describes all of the values for which the graph is negative and increasing? all real values of x where x< -2 all real values of x where -2