Question: Use the small increments formula to estimate the change in z = xy - 15x + 20y when x decreases from 4 to 3.9 and
Use the small increments formula to estimate the change in z = xy - 15x + 20y when x decreases from 4 to 3.9 and y increases 0.4 from 2.
Estimate the change of z with 1 decimal position (type the value with no additional text or explanation).
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