How many flags can be made with 3 different color stripes each color can only be used once? colors red, blue, & yellow. you get 15 pts

How do you use the elimination method for this question? explain, because i really want to understand!

Abcd is a square. what is the measure of angle bac

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.