Question 5
arrange the digits 5, 3, 7, 2, 1 to create the lowest possible five-digit
number.
12,735
15,723
53,721
12,357
none of these answers are correct.

The answer choice 12,357 is correct. Since the numbers are ascending from lowest to greatest, the number couldn’t possibly be any smaller then this certain answer choice. So the correct answer to this question is 12,357.

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°.