Sean is conducting an experiment with an isotope of a particular element that has a half-life of 4 hours. he begins with a sample of the isotope with a mass of 85 grams. he then measures the mass of the object every hour. what is the approximate mass of the sample after 24 hours?

Determine the volume of a cylinder bucket if the diameter is 8.5 in. and the height is 11.5 in.

Three students, javier, sam, and corrine, participated in a fundraiser where people donated a certain amount of money per lap that the student ran. each student also had some initial donations that were collected before the run. the equations that represent each student's total donation, y, based on the number of laps ran, x, is shown below. match each equation with the correct rate of change for that student.

The high temp today was 62°. when nighttime comes, the temp will drop 40°. by 4am the temp will drop an additional 40°. what is the temp at 4am?