-
7 - 9 = 7+(-9)
Add.

-2=-2

Step-by-step explanation:

yes both are equal

∠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°

e

step-by-step explanation:

an equation by definition has to have two or more variables (x and 2 in this case)