I think that I have the correct answer but it just seem so simple could someone double check me please. What is the perimeter of a triangle whose sides are the length of 4x,4x+7, and x=

Thank you in advance

The other question I need to right an equation and find the solution to the problem you have three buildings with the total height of 1800 ft. Building 1 is 4 times higher than building 2 and building 3 is 300ft higher than building 2. So I need the equation I would use to solve the problem

Please help thanks again anyone.