choose the one expression below that is true. a. 14 - (19 + 3) = (14 - 19) + 3 b. (6 - 5) + 11 = 6 - (5 + 11) c. 18 - (10 + 9) = (18 - 9) + 10 d. (3 + 2) + 10 = 3 + (2 + 10)

Solve these problems: 1.what is the perimeter of an equilateral triangle with sides measuring 6cm? 2. a regular pentagon has sides measuring 3.2 cm. what is its perimeter? 3. a regular decagon has sides of 3.5mm . what is it’s perimeter? 4. a regular octagon has a perimeter of 64cm. what is the length of one of the sides? 5. a regular hexagon has a perimeter of 72mm . what is the length of one of the sides? 6. what is the perimeter of a rhombus with sides measuring 11m?