What property is used for 12=-28+13c

Abox contains 1 plain pencil and 4 pens. a second box contains 5 color pencils and 5 crayons. one item from each box is chosen at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected? write your answer as a fraction in simplest form.

How many lines can be drawn through points j and k? 0 1 2 3

In angle pqr find the measure of