As you know, when a course ends, students start to forget the material they have learned. One model (called the Ebbinghaus model) assumes that the rate at which a student forgets material is proportional to the difference between the material currently remembered and some positive constant, a.
A. Let y=f(t) be the fraction of the original material remembered t weeks after the course has ended. Set up a differential equation for y, using k>0 as any constant of proportionality you may need. Your equation will contain two constants; the constant a (also positive) is less than y for all t. What is the initial condition for your equation?
B. Solve the differential equation.
C. What is the practical meaning (in terms of the amount remembered) of the constants in the solution? If after one week the student remembers 75 percent of the material learned in the semester, and after two weeks remembers 69 percent, how much percentage of the material will she or he remember after summer vacation (about 14 weeks)?

g(x) is the negative form of f(x)? because whenever its the negative form it reflects its self over the x axis. idk if this is right though.

step-by-step explanation:

the clues that signal the reader should change tone are the punctuation marks, the grammatical signs. for example, the quotation marks at the beginning of something someone else said literally or the exclamation marks.

the tone of the first line of dialogue until "gettysburg" is a kind tone, a tone of advise. the narrator is trying to the other person in doing something he or she obviously is finding hard to do by giving a piece of advise and bringing up a memory of a successful similar case.

the clue that the reader understand how to read the word "bang" is the exclamation mark. it gives the word a surprise tone, a strong accent.

the best tone for reading the word "bang" is an exciting tone, a surprise one, even a loud one.

the words that should be read with a formal tone are the ones that give factual information. the sentence: mister lincoln couldn't think of anything to say at the gettysburg" gives information about an event and it needs to be read formally, also, when the narrator wants to transmit calmness, a formal and slow tone is needed, because people also transmit messages with the vibrations of our voices and tones.

the answer is b.)

< 1=< 2

"exterior angles = 360 / number of sides.

60 = 360 / sides

sides = 360 / 60

sides = 6"