Choose the more precise measurement. 82.1mm; 48.3cm please hurry!!

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)

At your job you're paid $50 per week plus $3 per sale at least how many saled do you need to make in order to have over $250

If you were constructing a triangular frame, and you had wood in the length of 4inches, 4 inches, and 7 inches, would it make a triangle? would you be able to create a frame from these pieces of wood? yes or no. explain your mathematical thinking