Find the domain and range and describe the level curves for the function f(x,y). f(x, y) = √√4x² - y² O Domain: all points in the xy-plane; range: real numbers 0 ≤ z ≤ 2; level curves: circles with centers at (0,0) and radii r, 0 < r ≤2 Domain: all points in the xy-plane; range: all real numbers; level curves: circles with centers at (0, 0) Domain: all points in the xy-plane satisfying x² + y² = 4; range: real numbers 0 ≤ z ≤ 2; level curves: circles with centers at (0, 0) and radii r, 0 < r ≤ 2 O Domain: all points in the xy-plane satisfying x² + y² ≤ 4; range: real numbers 0 ≤ z ≤ 2; level curves: circles with centers at (0, 0) and radii r, 0 < r ≤ 2

Q: Let f(u)= √u and g(x) = u = 4 + 12x². Find (f o g)'(1). (fog)'(1) = (Type an exact answer.)

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