1.Given f(x,y,z)=(x^2)y-(y^3)z, find f(-1,2,3)
2.A storage building is planned which will have a rectangular base and a flat roof. The base will cost $10 per square foot. Each side will cost $7 per square foot. The roof will cost $8 per square foot. find the equation to express the construction cost of this building as a function of length x, width y, and height z.
3.Given f (x,y,z)=ln((x^2)y-(y^3)z). find f/z and ^2f/yz
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