a) the function is single variable/ multivariable?

b) the function is scalar function/ vector function?

c) the function is region of integration/ an integrand

explain your answer.

1. Define F₁ : [0,1] x [0,1] -> R² by

f₁(x,y) = (-y , x)

2. Define f_2: [-2,2] x [ -2,2] --> R³ by

f₂(x,y) = (x, y , 9-x²-y²)

pls show detail steps and explain