HELPP I LOST MY BRAINCELLS WHILE TRYING TO WORK IT OUT ILL BE BRAINLISTING WHOEVER HAS A GO!

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1. a and be

2. 7

3. 8

4. An expression is a number, a variable, or a combination of numbers and variables and operation symbol whereas n equation is made up of two expressions connected by an equal sign.

∠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°