Given the following three sequences:
1. 2, 4, 6, 8, 10.
II. 2, 4, 8, 16, 32.
III. a, a + 2, a + 4, a + 6, a + 8..
Which ones are arithmetic sequences?

Options one and three

Step-by-step explanation:

A arithmetic sequence is a sequence of numbers or letters that increase or decrease the same amount. In this case options "one and three" are arithmetic sequences because the amount they increase by stays the same while in option two the increase goes from 2 to 8. To find a arithmetic sequence just find the rule of the set of numbers and if the numbers increase or decrease stays the same then it's  a arithmetic sequence.

Hope this helps.

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step-by-step explanation:

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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°.