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1. (2 pts each) Circle the formula for the volume obtained by rotating the illustrated region R about the axis x = k or y = k, as indicated. (a ) V = S. = ((f (x) - k)? - (9(1) - k)?) dr (b) V = S. = ((f (x) - 9(x))? - k) dx (c) V = [ 2m(x - k)(f(x) - g(z)) dr (d) V = [#2x(k - y)(f(y) - g(y)) dy (a) V = [=(f(x) - k)3 dr (b ) V = S. m(k - f(x))= de (c) V = S. 2m(k - x)f(x) dx (d) V = [ 2x(x - k)f(z) dr (a) V = [ 2x(k - x)(f(x) - g(x)) dr (b ) V = [ 2x(x - k)(f(x) - g(x)) dx (c) V = [2x(k - x)(g(x) - f(x)) dx (d) V = [2x(x - k)(g(z) - f(x)) dr (a) V = [2n(y -k)(f(y) - a) dy (b) V = [. 2x(y -k)(a-f(y)) dy (and) (c) V = J.2 (k - y)(f(y) - a) dy R (d) V = [2x(y - k)(a- f(y)) dy (a.c)