Alan, Selena, and Tiki simplify the expression 5 – 2(x + 2). The results are shown. Alan: 9 – 2x Selena: 1 – 2x Tiki: 3x + 6

Who is correct? Justify your answer by showing the work. Then explain the errors of the other students.

14

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°.

i would need to see the shape

step-by-step explanation: