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

Hint: Simplify

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