Select the correct answer. The tables show the subscription costs for two magazines. What is the ratio of the cost of Magazine A to the cost of Magazine B?

Magazine A Magazine B
Duration of Subscription Subscription Cost
(dollars) Duration of Subscription Subscription Cost
(dollars)
12 months 36 12 months 32
24 months 72 24 months 64
36 months 108 36 months 96
A.
9 : 4
B.
9 : 7
C.
9 : 8
D.
9 : 5

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°.