Posted by Calculus on Thursday, October 7, 2010 at 3:49pm.
your graph consists of two straight lines
y = 5t-7 and y = -5t + 7 where you only want the part above the t-axis (x-axis normally)
The two lines meet on the t-axis at the point (7/5 , 0)
That point is called a "cusp" and it would be the only critical number.
Differentiating the function would be over-kill since when you find the derivative of a straight line, you just get the slope, which we knew already anyway.
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