How long is side c if side a=6 and b=2? Round your answer to 2 decimal places?

Figure abcde is a regular pentagon. segment ae is located at a (2, 1) and e (4, 1). what is the perimeter of abcde? 4 units 6 units 8 units 10 units

When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer

2.5 milligrams is equivalent to how many grams