What number is the opposite of -8.3?

"n" and "-n" are opposite numbers.

The sum of a opposite numbers is equal 0: n + (-n) = n - n = 0.

Opposite numbers have the same distance to number 0 (look at the picture).

Opposite of -8.3 is -(-8.3) = 8.3

∠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°