Which pair of expressions are equivalent? 3v + 5 - 9v + 2 and negative 6v + 6

Negative 6n + 3 - 2n + 2 and negative 8 n + 6

Negative 4n + 8 + 9n - 2 and 5n + 6

10n - 5 - 2n + 3 and 5n - 2

whoever answers this gets 50pts pls hurry

30.5*10=350$

you have to multiply the number without the decimal point then add it later but if its tenn u must move the place value of the decimal point 1 to the right.

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°.