With a coupon you get a pair of shoes that normaly costs 84 for only 72 what percentage was the discount

14.29%

Step-by-step explanation:

% Decrease = Decrease/ Original Number × 100

84-72 = 12 (or the amount of the discount)

12/ 84 * 100 = 14.29%

∠acb = 8°

step-by-step explanation:

∠xba lies on the circle and is half the measure of the intercepted arc ax

hence

measure of arc ax = 2 × 42° = 84°

∠acb is outside the circle and is

∠acb = (arcab - arcax ), hence

∠acb = 0.5 (100 - 84) = 0.5 × 16° = 8°