In each of the applied situations in Exercise, find an appropriate viewing window for the equation (that is, a window that includes all the points relevant to the problem but does not include large regions that are not relevant to the problem, and has easily readable tick marks on the axes). Explain why you chose this window. [Hint: You can’t make a negative number of shirts.]
A cardiac test measures the concentration y of a dye x seconds after a known amount is injected into a vein near the heart. In a normal heart
y = −.006x4 + .14x3 − .053x2 + 179x.
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