Agear ratio is the of the teeth on the front sprocket and the teeth on the rear sprocket and 12 teeth on the rear sprocket what is the gear ratio for the bike

∠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°

the answer to the expression is 83

b.-4 units

all you   do is count how many times you move