What is 10.4% written as a decimal?

Use set builder notation to represent the following set: { -3, -2, -1, 0}

Solve for x where 0 equation: cot^2x+2cotx+1=0

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