What would the extrema be for z = f(x, y) = (y^2)-(x^2)? And

What would the extrema be for z = f(x, y) = (x^2)-4xy+(y^3)+4y

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

Danielle earns a 7.25% commission on everything she sells at the electronics store where she works. she also earns a base salary of $750 per week. what were her sales last week if her total earnings for the week were $1,076.25?

If on=8x-8,lm=7x+4,nm=x-5,and ol=3y-6