Find the area of two sides (Length*Height)*2 sides. Find the area of adjacent sides (Width*Height)*2 sides. Find the area of ends (Length*Width)*2 ends. Add the three areas together to find the surface area. Example: The surface area of a rectangular prism 5 cm long, 3 cm. Hope this helps?!
<h2>Answer:</h2><h3>x = 13 </h3><h2>Step-by-step explanation:</h2><h3>3x+8=2x+21</h3><h3>solve for x3x8-2x+21</h3><h3>x8=21</h3><h3>x=21-8=13</h3><h3>solution is x=13/</h3><h2>HOPE IT HELPS!!!</h2><h2>PLZ I NEED BRAINLIEST!!</h2>
