What is the answer to this question, W+4=16?

What is the perimeter of an equilateral triangle if each side is (x+3)?

Select all of the categories that apply for the figure below. quadrilateral, trapezoid, parallelogram, rhombus, rectangle, square

Paul bakes raisin bars in a pan shaped like a rectangular prism. the volume of the pan is 252 cubic inches. the length of the pan is 12 inches, and its width is 10 1/2 inches. what is the height of the pan? enter your answer in the box. will give brialist and pointsss !