How can the Distributive Property be used to find 7 × 391? Choose all statements that apply. 7 × 391 = 7 × (300 + 90 + 1) 7 × 391 = 7 × (300 + 90 + 1) 7 × 391 = 7 + (300 + 90 + 1) 7 × 391 = 7 + (300 + 90 + 1) 7 × 391 = (7 × 300) + 90 + 1 7 × 391 = (7 × 300) + 90 + 1 7 × 391 = (7 × 300) + (7 × 90) + (7 × 1) 7 × 391 = (7 × 300) + (7 × 90) + (7 × 1) 7 × 391 = 2,100 + 630 +

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°.