\"\"

\

From the diagram the sides of a triangle are \"\".

\

Perimeter P = 49in.

\

To Find: x.

\

\"\"  \"\"           (Formula for perimeter)

\

\"\"         (Substitute: Perimeter P = 49in)

\

\"\"                (Add: \"\")

\

\"\"  (Subtarct 30 from each side)

\

\"\"           (Apply addiitve inverse propetry: \"\")

\

\"\"                (Apply addiitve identity propetry: \"\")

\

\"\"                       (Subtract: \"\")

\

The unknown side length of the triangle is 19 in.

\

\"\"

\

The unknown side length of the triangle is 19 in.