A certain medicine has a half-life of 20 minutes. At 6:00pm you took a 420mg dose. a) Model this situation with an exponential function.

b) Find the number of mg of medicine remaining in your system at 10:30pm the same day.

The surface area (sa) of a cube with a as the length of each of its sides is given by the formula . if the surface area is known, how can you rewrite the formula to find its side?

Can someone me my sister? she is in third grade. 50 points and brainlist! ones that are not answered. plz and thx!

Tom is the deli manager at a grocery store. he needs to schedule employee to staff the deli department for no more that 260 person-hours per week. tom has one part-time employee who works 20 person-hours per week. each full-time employee works 40 person-hours per week. write and inequality to determine n, the number of full-time employees tom may schedule, so that his employees work on more than 260 person-hours per week. graph the solution set to this inequality.