Solve the following algebraically (x+3)^2-4=-3x-8

Let event a = you roll an even number on the first cube.let event b = you roll a 6 on the second cube.are the events independent or dependent? why?

Which term describes the point where the perpendicular bisectors of the three sides of a triangle intersect?

Will mark brainliest! ( explain the answer too, it can be one sentence)