celinegirl
  • celinegirl
Keira created color panels for a wall using a mix of only red and blue paints. She plotted the quantities of red and blue paints used for each mix and connected them using a line segment, as shown in the graph below:
Mathematics
jamiebookeater
  • jamiebookeater
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celinegirl
  • celinegirl
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celinegirl
  • celinegirl
Which statement best describes the domain of the function represented in the graph? 3 ≤ x ≤ 12 or x is between 3 and 12, inclusive 3 ≤ x ≤ 7 or x is between 3 and 7, inclusive 2 ≤ x ≤ 12 or x is between 2 and 12, inclusive 2 ≤ x ≤ 7 or x is between 2 and 7, inclusive
phi
  • phi
the domain are the "x values" this should be obvious, because ll the choices are about "x" to find the x values, put you pencil on the left end point of the line, and go "straight down" what x number to you reach ?

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celinegirl
  • celinegirl
@phi Ah I see.. I might be wrong but I think its A.
phi
  • phi
put you pencil on the left end point of the line, and go "straight down" what x number to you reach ?
celinegirl
  • celinegirl
@phi 2?
phi
  • phi
go straight down (like the red line). what number are you at ?
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celinegirl
  • celinegirl
@phi oh 3
phi
  • phi
now do the same for the right end point of the line. put your pencil on the right end, and go straight down. what x number are you at ?
celinegirl
  • celinegirl
@phi 7 right?
phi
  • phi
that means the line is "defined" from x =3 to x=7 that is the domain.
celinegirl
  • celinegirl
@phi ah i see. So its B?
phi
  • phi
yes
celinegirl
  • celinegirl
@phi thank you so much!

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