Question

find the value of x in each of the following.
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Answer 1

I'm asuming names of the vertices as shown in the above attachment

<EDF+<EDC=180(linear pair)

x+<EDC=180

<EDC=180-x

<BCD+<BCG=180(linear pair)

<BCD+90=180

<BCD=180-90=90

<EAB+<ABC+<BCD+<CDE+<DEA=540(angle sum property of a pentagon)

85+2x-10+90+180-x+120=540

465+x=540

x=540-465

x=75°

I hope my answer helps you ☺☺