The answer is c: 288 cm^3
I think...
Answer:

Step-by-step explanation:
So we have the equation:

And we want to write it in terms of m.
So, let's subtract b from both sides:

Now, let's divide both sides by x:

And we're done!
Find the area of the rectangle and the 1/2 circle, then subtract the half circle's area from the rectangle's.
Area of the rectangle is 30in.
Area of the 1/2 circle is 19.625.
Subtract
30-19.625
10.375
(Round it to 10.4 in this case)