To find the sum of the interior angles of a heptagon, divide it up into triangles ... There are five triangles... Because the sum of the angles of each triangle is 180 degrees... We get.
10 * (1.025)^9 = 12,48
Maybe 12.49 depending on rounding.
130 oz is bigger than 8 pounds because 1 pound is equal to 16 oz
I suggest using the app called photomath. It helps. Here is the answer I got: (click pic)