Answer: X = 35 (if this quadrilateral is a rectangle)
Step-by-step explanation: The sum of the interior angles of a rectangle equals 360. Basically, each angle in a rectangle measures 90 degrees.
Hence, from the equation given, addition of all terms must equal 360.
7x - 4 + 3x + 14 = 360
7x + 3x + 14 - 4 = 360
10x + 10 = 360
Subtract 10 from both sides of the equation
10x = 350
Divide both sides of the equation by 10
x = 35
