Step-by-step explanation:
the area =
= 
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The two pieces are continuous for every 
So, our only concern is to make sure that the pieces "glue" continuously at x=7.
To ensure this, we evaluate both pieces at x=7, and impose that the two values are equal.
The first piece evaluates to

The second piece evaluates to

So, we want

We move all terms involving c to the left hand side, and all the numerical constants on the right hand side:

Answer:
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Step-by-step explanation:
Check the picture below.
make sure your calcualtor is in Degree mode.