Is this collection of event a BNC mutually exclusive saying you can't type all of that in here that's the problem with like the size

Ajar of gumballs contains 4 reds, 2 greens, and 6 blues. what is the probability of getting two blues in a row without replacement?

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

The figure below shows rectangle abcd and the triangle eca on a coordinate plane.which of the following expressions represents the perimeter of triangle of triangle eca in units