an equilateral triangle has side lengh equal to the fourth side of qualrillateral what is the permeter of the triangle​

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

Just tell me how to set up the equation.

If the value of x increases by 5, how does the value of m(x + 3) change? a) it increases by 5m. b) it increases by 8m. c) it decreases by 5m. d) it decreases by 8m.