1. Identify the center and radius of the circle with the given equation in each item. Sketch its graph, and indicate the center.

(a) x^2+y^2=49

(b) 4x^2+4y^2=25

(c) 〖(x-7/4)〗^2+〖(y+3/4)〗^2=169/16

(d) x^2+y^2-12x-10y=-12

(e) x^2+y^2+8x-9y=6

(f) x^2+y^2+10x+12y=-12

(g) 〖2x〗^2+〖2y〗^2-14x+18y=7

(h) 〖4x〗^2+〖4y〗^2-20x+40y=-5

(i) 〖9x〗^2+〖9y〗^2+42x+84y+65=0

(j) 〖2x〗^2+〖2y〗^2+10x=2y+7

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