#Find Domain/ Range of F using interval Notation

106 messages · Page 1 of 1 (latest)

sterile salmon
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Someone pls help. I only have to answers 3 questions in a row to move on! It’s basically algebra

high muralBOT
sterile salmon
plush linden
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you're god's son right can't you ask him for help

sterile salmon
fresh ivy
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in interval notation, () means exclude that point and [] means include, so for open points you exclude, meaning you use ()

plush linden
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domain is the set of x values the function can input
range is the set of y values the function can output

sterile salmon
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Ok one sec!

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Domain: [-4,5)
Range: (-2,4)

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??

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I’m rlly bad at this so😭

plush linden
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don't confuse the x and y values

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the doman is [-4, 4)

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and the range should also be [ )

sterile salmon
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Wait

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Can you explain why the domain is [-4,4)

plush linden
sterile salmon
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Ok that makes sense

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Would the range be [5,-2)

plush linden
sterile salmon
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Oh ok

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Always?

plush linden
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yes

sterile salmon
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AY WE GOT IT RIGHT

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Ok let me try this next one on my own

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To see if I get it right

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Wait if both circles are open I’m just gonna use (,)

plush linden
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closed circle means bracket, open circle means parentheses

sterile salmon
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Ok I think I found the domain

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Let me send the graph

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And the range would be (-4,1)

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?

plush linden
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nope

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the graph stretches all the way up to y=5

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so it would be (-4, 5]

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you have to look for the lowest and the highest points on the graph, which will only sometimes be the endpoints

sterile salmon
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Hm ig that kinda makes sense

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And just to be sure it’s a parentheses

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And then a bracket

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Wouldnt it be (,) cuz its open

plush linden
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no, the graph reaches y=5 so you'd use a bracket. open circle means the point isn't actually part of the graph

sterile salmon
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Okay

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I did the next problem

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Is this right

plush linden
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domain is correct

sterile salmon
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Oops

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So -5,4

plush linden
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and it should be [ ] because even though one of the ends has an open circle, the graph still reaches y=4 on the other side

sterile salmon
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Ok I have one more

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Domain will be (,)

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Right

plush linden
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yes

sterile salmon
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And range is [,)

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Or no

plush linden
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range is also (,)

sterile salmon
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So

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(-5,2)

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?

plush linden
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yes that's the range

sterile salmon
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I GOT IT RIGHT

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Wait

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I also have these problems i have hella trouble with

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Can you help me with them? I understand it but I always make one mistake

plush linden
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sure

sterile salmon
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Ok let me solve

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Ok so for A

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125 minutes Plan A would cost $10.
And Plan be is $20. Meaning the answer would be Plan A cost more and it costs $10 more

plush linden
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plan B costs more you mean

sterile salmon
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Yeah sorry😭

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Ok now for B

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250 minutes and then plan B?

plush linden
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yes

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plan A costs more after 250

sterile salmon
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I always get the second question wrong just bc it’s always gonna be the same plan

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Oops I got it wrong 😭

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I chose plan b again lol

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Ok new prob

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A. Bills Car 4 gallons b

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???

plush linden
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yes

sterile salmon
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B. 180 and Josh’s car?

plush linden
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which line is above the other when x<180?

sterile salmon
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The blue one

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So that means he will have more gas remaining?

plush linden
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yes

sterile salmon
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Ok next

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A. Options A and $50?

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B. 50 miles and Options A?

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Wait no B

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LES GO

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ok last one!

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A. Residential plan and $4?

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B 14. And business plan?

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LETS GO OMG

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thank you so much

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Literally I was stuck on it for two days