# MATH

Question 1
A) How do you know whether a relation is a function?(1 point)

-By determining if each value from one set maps to another set such that each element of the domain pairs with exactly two elements of the range.

-By determining if each value from one set maps to another set such that exactly one element of the domain pairs with exactly one element of the range.

-By determining if each value from one set maps to another set such that each element of the domain pairs with exactly one element of the range.

-By determining if each value from one set maps to another set such that exactly one element of the domain pairs with exactly two elements of the range.**

Question 2
A) A domain consists of the values 1, 2, 3, and 2. A range consists of the values 5, 10, 15, and 20. The 1 in the domain corresponds to the 5 in the range, the first 2 in the domain corresponds to the 10 in the range, the 3 in the domain corresponds to the 15 in the range, and the second 2 in the domain corresponds to the 20 in the range. Does this relation represent a function? Explain.(1 point)

-It does not represent a function. Each value in the domain corresponds to exactly one value in the range.

-It does represent a function. Each value in the domain corresponds to exactly one value in the range.**

-It does not represent a function. The domain value of 2 corresponds to two values within the range.

-It does represent a function. The domain value of 2 corresponds to two values within the range.

Question 3
A) Juan has blood type A, Lilly has blood type AB, and Aaron has blood type O. Is this relation a function? Explain.(1 point)

-This relation is not a function. Each name in the domain corresponds to exactly one element in the range of blood types.

-This relation is a function. Each name in the domain corresponds to exactly two elements in the range of blood types.

-This relation is a function. Each name in the domain corresponds to exactly one element in the range of blood types.

-This relation is not a function. Each name in the domain corresponds to exactly two elements in the range of blood types.**

Question 4
A) Determine if the set of points (−1,3), (2,5), (3,8), and (4,5) is a function. Explain.(1 point)

-The set of points is a function because the range consists of the value 5 two times.

-The set of points is a function because each value in the domain corresponds to exactly one value in the range.**

-The set of points is not a function because each value in the domain -corresponds to exactly one value in the range.

-The set of points is not a function because the range consists of the value 5 two times.

Question 5
A) Isa and Benny are both in Mrs. Johnson's class, Patrick is in Mr. Jimenez's class, and Jose is in Mrs. True's class. Is this relation a function? Explain.(1 point)

-This relation is a function because each student is in exactly one teacher's class.

-This relation is not a function because both Isa and Benny are in Mrs. Johnson's class.**

-This relation is not a function because each student is in exactly one teacher's class.

-This relation is a function because both Isa and Benny are in Mrs. Johnson's class.

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1. #1 no each domain element is used only once
#2 no. See #1. How can f(2) be both 10 and 20?
#3 it is a function. See #1 -- each person has only one blood type
#4 correct. How did you miss the first three?
#5 "is in her class" is a function, because each student is in only one class.
"teaches only" is not a function, because Johnson has two students.
Before deciding on a function, you need to define the relation.

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oobleck
2. so what are the other answers?

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3. i think the first one might be number C?

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4. yes, #1 is C
and the same reasoning applies to all of these questions!

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oobleck
1.C
2.A
3.C
4.B
5.D
Is this it???

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6. heyy, ok so imma leave the answers so u can check with them, and ill write it out so u don't get confused up on the answer choices
(the answers are from the literal quick check btw)

also, this video is really helpful, helped me answer all of them
(look up virtual nerd, how do you figure out if a relation is a function?)(, not allowed to post urls on here)

1. By determining if each value from one set maps to another set such that each element of the domain pairs with exactly one element of the range.
-explanation- there can be variation of numbers in the y coordinates, but not in the x.

2.It does not represent a function. The domain value of 2 corresponds to two values within the range.
-explanation- there are two 2's in the x coordinates. yes, there is a repeat of 2 fives in the y, but that's ok, REPEATS ONLY MATTER IN THE X COORDINATES

3. This relation is a function. Each name in the domain corresponds to exactly one element in the range of blood types.
-EXPLANATION- ok, so when you write it out (that's what i did for like, all of them) you see there are no repeats whatsoever, making this a function

4. The set of points is a function because each value in the domain corresponds to exactly one value in the range.
-explanation- no repeats in the x coordinates, but there is in the y coordinates, but again thats fine, as long as there is only one of each in the x coordinates

5. This relation is a function because each student is in exactly one teacher's class.
-explanation- there is a repeat in the y coordinates, but none in the x. so it's a function!

heres me tyrna explain the whole graph thing that i keep mentioning. ok so take number 5 as an example.
Isa and Benny are both in Mrs. Johnson's class, Patrick is in Mr. Jimenez's class, and Jose is in Mrs. True's class. Is this relation a function? Explain.

x | y
isa |johnson's class
benny |johnsons class
patrick|Jimenez's class
jose | True's class

so you see, there is no repeats in the x column. making it a function. but it's 100% ok for there to be a repeat in the y column.
again i REALLY recommend watching that video for anybody who doesn't understand this, cuz this will be repeated for like, the rest of high school.
hope this helped!!

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7. thx

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8. So are those answer's right?

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9. well ye, gotem after i took the test so it should all be right

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10. thank you yeet, saved my oo

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11. np

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12. What about the connexus people on delta math we have different problems

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13. hi

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