Solve 3(x+4)=18 x=2 x=6 x=0 x=-2 Which of the following polygon is a regular polygon? Scalene triangle Square Trapezium Parallelogram

To solve the equation $3(x+4)=18$, we need to isolate the variable $x$.<br /><br />Step 1: Distribute the 3 on the left side of the equation:<br />$3x + 12 = 18$<br /><br />Step 2: Subtract 12 from both sides of the equation:<br />$3x = 6$<br /><br />Step 3: Divide both sides of the equation by 3:<br />$x = 2$<br /><br />Therefore, the correct answer is $x=2$.<br /><br />A regular polygon is a polygon with all sides and angles equal. Among the given options, the square is a regular polygon because it has four equal sides and four equal angles. The other options, such as scalene triangle, trapezium, and parallelogram, are not regular polygons.