Explanation:
For the first one, you need to insert the 4 where the x is located in the function and solve.





Answer:
32
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For the second one, the domain is all the x values and the range is all the y values. You have a few order pairs / points. A point has a formate of (x, y).
By knowing a point has a formate of (x, y), we can find the domain by gathering all of our x values and we can find the range by gathering all of our y values.
(x, y)
(1, 3)
(2, 6)
(3, 9)
(4, 12)
x = domain values = {1, 2, 3, 4)
y = range values = {3, 6, 9, 12)
Answer:
domain = {1, 2, 3, 4)
range = {3, 6, 9, 12)