Three students attempt to define what a circle is. Can you match the teacher's comments to the
definitions?
Definition of a circle
Teacher's comments
Duru's definition: The set
of all points in a plane that
are the same distance away
from some given point,
which we call the center.
You seem to be
confusing a circle with
a sphere.
Oliver's definition: The set
of all points in 3D space that
are the same distance from
a center point.
Stupendous! Well
done.
Carlos's definition: A
perfectly round shape.
Your definition needs
to be much more
precise.

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.