The answer is D because you would multiply 6 to every number in the equation 6 time 5 + 6 times 3<span />
The answer is 21.
Hope this helps. Have a nice day.
The sum of all interior angles in a polygon is
180(n-2), where n = sides, well, this is a QUADrilateral, so it has 4 sides, so the total is 360°.
now, let's find what angle C is first,

now, recall the "inscribed quadrilateral conjecture", where opposite angles are "supplementary angles", thus
10 is the stubstitution for 5 q, since 2 plus 5 equals 7. What is 10 divided by 5?