Maxim/minimum extrema derivatives
one model of worldwide oil production is the function given by the following formula where p(t) is the # of barrels in billions produced in a year, t years after 1933. according to this model, in what yaer did worldwide oil production achieve an absolute maximum? what was that maximum?

p(t)=0.218t^4-0.167t^3 0.00156t^2 0.002t 0.22 0 (theyre greater than or equal too)

Jeffery conducted a survey in his school and found that 30 of the 50 eighth grade students' favorite subject is mathematics. based on the results, jeffery concluded that out of the 200 students in his school, 120 students' favorite subject is mathematics. select the statement that is true about jeffery's conclusion. a. jeffery's conclusion is not valid because the sample was biased since only 200 students were surveyed. b. jeffery's conclusion is valid because the sample was random since all of the students were eighth grade students. c. jeffery's conclusion is valid because the sample was random. d. jeffery's conclusion is not valid because the sample was biased since all of the students were eighth grade students.

Me with geometry ! in this figure, bc is a perpendicular bisects of kj. dm is the angle bisects of bdj. what is the measure of bdm? •60° •90° •30° •45°

25 ! i need asap! ! ill mark brainliest!