Solve for X

You have one right angle and 123 degree angle and X angle

How to solve?​

Evaluate cos2θ for cosθ = square root of 3/2

Complete each statement from the information given and the triangle criterion you used. if the triangles cannot be shown to be congruent, leave the box for the second triangle blank and choose for reason “cannot be determined.” carbon - regular hexagon. ∆can ≅ ∆ by

Which expression is the factorization of x^2+10+21