A jar contains 4 green marbles, 2 brown marbles, and 1 gray marble. You draw one marble from the jar at random and without replacement, you draw a second marble. What is the probability of drawing a green marble and then a gray marble? A.
5
8
B.
2
21
C.
5
56
D.
4
42

step-by-step explanation:

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answer: $1794

step-by-step explanation:

1. 180°. the sum of the interior angles of a triangle is 180°, for the equilateral triangle that it has three equals side is 60°+60°+60°=180°.

2. 60°. each interior angle of a equilateral triangle is 60°

3. 120°. the measure of ∠m is 120°, the sum of the angles ∠m and ∠n is equal to 180°. so, in order to find the measure of ∠m, we have ∠m+∠n=180° > ∠m=180°-∠n > ∠m=180°-60°=120°.

4. 360°. the sum of the exterior angles of an equilateral triangle is ∠m+∠r+∠x=120°+120°+120°=360°. the exterior angles of any triangle always add 360°.