What is the value, in degrees, of x?

If square root x = -7, then x= -49 true or false

2.5 milligrams is equivalent to how many grams

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