Simplify 6 - squareroot25 divded by 4

Pls! does anybody know a shortcut for answering these types of questions in the future?

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?

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