One model of Earth’s population growth is p(t)=64/(1+11e^-0.8t), where t is measured in billons of people. Which of the following statements are true?
A. The population of Earth will grow exponentially for a while but then start to decrease.
B. The carrying capacity of Earth is 64 billion people.
C. The population of Earth is growing at a rate of just under 8% per year
D. In 1991, there were 5.74 billion people, according to the model

Martha has a deck of cards. she has lost some of the cards, and now the deck only contains nine spades, eleven diamonds, eight clubs, and twelve hearts. martha predicts that whenever she draws a card from the deck without looking, she will draw a club one-fifth of the time. which activity would best allow martha to test her prediction? a. randomly draw a card from the box and see if it is a club. b. randomly draw a card. then, continue to draw another card until all eight clubs are drawn. c. randomly draw and replace a card 120 times. then, observe how close to 30 times a club is drawn. d. randomly draw and replace a card 100 times. then, observe how close to 20 times a club is drawn.

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.

An object in geometry with no width, length or height is a(n):