# Math help!

Which of the following is the domain of the function {(3,6),(5,7),(7,7),(8,9)}
1. {3,5,7,8}
2. {6,7,9}
3. {(6,3),(7,5),(7,7),(9,8)}
4. {1,3,5,7,9}

Is the following relation a function? {(0.3,0.6),(0.4,0.8),(0.3,0.7),(0.5,0.5)}
1. Yes
2. No
3. Cannot be determined

Help would be greatly appreciated, the faster I know the answers the better :(

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1. the domain is the set of all the 1st elements in the pairs. So, #1

No. 0.3 is used more than once.
f(0.3) cannot be both 0.6 and 0.7
Time to review what makes a relation a function.

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2. Question 1

The domain is all the x-coordinates in any given point in the form (x, y).

So, the domain is {3, 5, 7, 8}.

Question 2

The answer is no. Why no? The value of the x-coordinate cannot be repeated. We can see that the point
(0.3, 0.6) and the point (0.3, 0.7) both share x = 0.3. This means that f(0.3) leads to TWO y values. When this happens, we have no function.

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3. 1.A
2.B
3.A
4.C
5.D

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4. A
B
A
C
D
those are right
screw logan paul you lost take the L

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