exam Maths Puzzle Numerical Ability

y^2+10y+21/y^2+12y+35 please show me how to simplify this expression and how to set it up correctly

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exam Other Question

Two lines have slopes 2k-4 and k+6. What value(s) of k will produce perpendicular lines? I think the answer is k=-4+or- sqrt66/2???????? Melissa is driving a sports utility vehicle along the interstate at a constant speed of 55 mph. A sports car one-half mile behind her that is moving at a constant speed passes her in 60 seconds. How many miles per hour is the speed of the sports car?