Question 126359
Remember the sum of all four angles of any quadrilateral is always 360 degrees. So in other words, we have the equation:


{{{A+B+C+D=360}}}



{{{4x+10+108+67+3x=360}}} Plug in {{{A=4x+10}}}, {{{B=108}}}, {{{C=67}}} and {{{D=3x}}}





{{{7x+185=360}}} Combine like terms on the left side



{{{7x=360-185}}}Subtract 185 from both sides



{{{7x=175}}} Combine like terms on the right side



{{{x=(175)/(7)}}} Divide both sides by 7 to isolate x




{{{x=25}}} Divide


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Answer:

So our answer is {{{x=25}}}