book Maths Puzzle Numerical Ability

not really understanding this, so can u help? And show how u did it so i can understand please?

its a fraction>> 1 over 4 c+2=3 over 4

please let me know if u cant understa

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book Other Question

THe instructions say divide. The problem itself is (4x-4 / x) / (10x-10 / 7x^2). I have come up with 28x^2(x-1) / 10x(x-1). Can anyone please tell me if this is the correct answer. Thanks in advance. Find an equation of the line (in either general form or slope intercept form) that contains the centers of the following two circles:

x^2+y^2-4x+6y+4 = 0 and x^2+y^2+6x+4y+9 = 0