There are 4 shut doors in front of you. you know that each door has an animal painted on one side and a plant painted on the other side. the four doors have the following painted on the sides that you can see (one per door): a lily, a pine tree, a fox, and an eagle. you have been told that these doors satisfy the rule "if a door has a flower on its plant side, then it has a bird on its animal side". which is the smallest set of doors that you must check the hidden side of to determine conclusively whether this rule is true or false for these doors?

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation:

answer: it is a.,b.,d.

step-by-step explanation:

step-by-step explanation:

for exempl this   system of equations   y = x - 3

                                                                y = 2x - 5

look   the line : y = x -3     ( red)

                            the line : y = 2x -5 ( bleus)