Questions asked
Thuc Nguyen
Numerade educator
In order to determine the effect companion animals might have on the moods of elderly people living alone experimenters created six groups from a large population of single people over 70 years old. They had three groups: those without pets, those who owned a dog, and those who owned a cat. They randomly selected 50 men from each of those groups and 50 women from each of those groups for a total of 300 participants. Which of the following statements about this study is correct?
Naresh Bagrecha
At a time t hours after it was administered, the concentration of a drug in the body is f(t) = 27e^-0.14X. What is the concentration of 4 hours after it was administered? At what rate I the concentration changing at that time?
Aparna Shakti
Obtain the average acceleration of the car for the last 10 seconds
Dominique Jan Tan
At a time t hours after it was administered, the concentration of a drug in a body is f(t) = 27e^-0.01t ng/ml. What is the concentration 4 hours after it was administered? At what rate is rate is the concentration changing at that time?
Brent Burkett
A rancher has 400 meters of fence for constructing a rectangle corral. One side of the corral will be formed by a barn and requires no fence. Three exterior fences and two interior fences partition the corral into three rectangular regions as shown in the figure below.
Eduard Sanchez
Initially, a tank contains 1000L of brine with 50kg of dissolved salt. Brine containing 10g of salt per liter is flowing into the tank at a constant rate of 10L/min. If the contents of the tank are kept thoroughly mixed at all times, and if the solution also flows out at a rate of 10L/min, how much salt remains in the tank at the end of 40 minutes.
Ramesh Rajak
Let f(x) be continuous. Find f(?/2) if: integral of f(t)dt = 2x(sin x + 1)
Suppose that f(?2)=2,f(6)=7,f?(?2)=5,f?(6)=3 , where f?? is continuous for all x.
Steven Clarke
If a curve passes through the point (1,5) and whose tangent line at a point has slope 4x , find the corresponding y value when x=2
A pollutant spilled on the ground decays at a rate of 8% a day. In addition, cleanup crews remove the pollutant at a rate of 30 gallons a day. Write a differential equation for the amount of pollutant, P, in gallons, left after t days