Use the two given functions to write y as a function of x.y = -2t + 5, t = -6x - 4

A. y = 12x + 1
B. y = -2x + 13
C. y = 12x + 13
D. y = 12x - 6

Answer: C

Mathematics

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Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = sin-1(x2 + y2)

A. Domain: all points in the xy-plane satisfying x² + y² ? 1; range: real numbers -  ? z ? ; level curves: circles with centers at (0,0) and radii r, 0 < r ? 1
B. Domain: all points in the xy-plane; range: all real numbers; level curves: circles with centers at (0, 0)
C. Domain: all points in the xy-plane; range: real numbers -  ? z ? ; level curves: circles with centers at (0, 0)
D. Domain: all points in the xy-plane satisfying x² + y² ? 1; range: real numbers -  ? z ? ; level curves: circles with centers at (0, 0)