exam Maths Puzzle Numerical Ability

I need to draw a construction and prove with reasons that trapezoid MN=one half (AB+DC) MN 11 DC 11 AB asap. please help.
thanks
I used the 11 for parallel

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exam Other Question

(x-1)(X^2+x-1)=0 Then angle x satisfies the equation 2tan^2x-5secx-10=0, where x is in the second quadrant. Find the exact value of sec x.

I know that the identity of 1+tan^2x=sec^2x may help me in this problem, but I am not sure what to do next. Thanks a lot!.