Question

1. What is the domain of the function below? (1 point)

A. {1,2,4}
B. {0,3,5,8}
C. {0,1,2,3,4,5,8}
D. {(0,2), (3,1), (5,2), (8,4)}

2. Is the following relation a function? {(0.3,0.6), (0.4, 0.8), (0.3, 0.7), (0.5, 0.5)} (1 point)

A. yes
B. no
C. cannot be determined

Answer 1

3. Sound travels about 343 meters per second. The function d(t)=343t the distance d(t) in meters that sound travels in t seconds. How far does the sound travel in 8 seconds?

A. 343 meters
B. 686 meters
C. 2,744 meters
D. 3,430 meters

Answer 2

domain of {(x,y)} is {x}
range of {(x,y)} is {y}
--
examples: domain of {(4,5),(6,9),(2,3)} is {4,6,2}
range of {(4,5),(6,9),(2,3)} is {5,9,3}

Answer 3

domain is the set of all the x values (that is first coordinate of each pair)
range is the set of the y values (that is the second coordinate of each pair)

Answer 4

A relation is a function if there is only one y value assign to each x value of the domain.
Example, {(4,5),(4,6),(3,2)}
This is not a function because there are two different y values assigned to the x value 4

Answer 5

the last question you are suppose to find the distance for when t=8 secs
the distance is given as 343*t
replace t with 8 and perform the indicated operation

Answer 6

so 3 is c?

Answer 7

is 2744 the product of 8 and 343?

Answer 8

if so yes

Answer 9

what do you think about number 2?

Answer 10

Remember: A relation is a function if there is only one y value assign to each x value of the domain.
So do you see more than one y value assigned to a particular x, or not?

Answer 11

no?

Answer 12

{(0.3,0.6), (0.4, 0.8), (0.3, 0.7), (0.5, 0.5)}
so you don't see two pairs or more
that have the same x but different y?

Answer 13

Oh wait haha the last one

Answer 14

wait maybe I read that wrong..

Answer 15

the x's are the first coordinate of each pair
the y's are the second coordinate of each pair

Answer 16

Let's look at the first x value that occurs in these pairs...
x=0.3
how many y's are assigned to x=0.3?

Answer 17

Ugh Ik you probably think I'm a dumb blonde (I am not blonde) Im sick right now and I have a headache. I don't get this at all and its hurting my head even more

Answer 18

Ok you can come back later if you want when you don't feel bad

Answer 19

Is it the first pair and the third?

Answer 20

That'll be a few days. Let's just get this over with

Answer 21

Ok so you said x=0.3 but y=0.6 and 0,7
Like I said for a relation to be a function only one y can be assigned to each x element of the domain
But here there is not just one y assigned to 0.3

Answer 22

So is the answer no?

Answer 23

As in b?

Answer 24

sounds finr
the first one I'm not sure what relation we are to look at

Answer 25

but you should be to list just the x values in that is domain

Answer 26

you aren't really suppose to list a number twice though

Answer 27

Okay thanks.

Answer 28

so did you want to give the relation we are to look at?
or do you think you got it?

Answer 29

I think I got it. Thanks for the help. :)