What is the area of a regular octagon with an apothem 16 inches long and a side 19 inches long? round the answer to the nearest inch?

The area of a regular octagon is given by:
 A = (4) * (L) * (ap)
 Where,
 L: side
 ap: apotema
 Substituting values we have:
 A = (4) * (19) * (16)
 A = 1216 square inches
 
 The area of a regular octagon with an apothem 16 inches long and a side 19 inches long is:
 A = 1216 square inches

The answer of the above question is

1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!