You divide the 15x by the 124. I know it sounds weird because you'll get a decimal, but that is what you are supposed to do because 124 is not a factor of 5.
Answer:
The company must sell at least 2 shirts to break even.
Step-by-step explanation:
Cost:
The cost is given by the following equation:

Revenue:
The revenue is given by the following equation:

How many t shirts must the company sell to break even?
Breakeven point is when the revenue is the same as the costs. So



Multiplying everything by 3



Since you cant make a decimal value of shirts
The company must sell at least 2 shirts to break even.
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1 &2 are linear pairs, 1&3 are vertical angles, 1&4 are linear pairs, 1&5 are corresponding angles
Problems a through c are asking you what the values would be at those values.
What will the value of
be at
? Let's look at the graph.
It seems at
,
, meaning that 
Let's do the same for the others.
At
, 
At
, 
For the last question, it is giving us the
value and asking us which
values would give us that.
At
,
.
*Note* this function is continuous to the right, meaning that there is another point where
.
Hope this helps.
頑張って!
The answer is 800 square feet. Hope this was helpful!