50-degree temperature is 0 minutes to heat = 50/0 = 50
60-degree temp. is 1 minute to heat = 60/1 = 60
70-degree temp, is 2 minutes to heat = 70/2 = 35
80-degree temp. is 3 minutes to heat = 80/3 = 26 2/3
90-degree temp. is 4 minutes to heat = 90/4 = 22.5
100 degree temp. is 5 minutes to heat = 100/5 = 20
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x + 12 = 13
Subtract 12 from both sides
x + 12 -12 = 13 - 12
x = 1
Answer
F. 1
In general, the domain is the set of all x-values for the graph.
The issue here is that this isn't the graph of a function. A function has at most one y-value for each x-value and this graph has an infinite number of y-values for the single x-value of 1.
So, either your teacher is wanting you to say the domain is {1}, because that's the only x-value used by the graph, or they're wanting you to say this is a trick question, because this isn't the graph of a function.
The range is the set of all y-values, which is -9<y<9, but again, do they intend this to be a trick question?
