Work out length AC.

10 cm
Not drawn
accurately

120
7 cm

Step-by-step explanation:

Well. Let's call α the 120° angle, and β its supplementary angle (80°). Let's draw also the height of the triangle. We'll call it CH. We know, from goniometric relations, that BC * sinβ = CH and BC * cosβ = BH. We just apply the pythagorean theorem so we get: AC = By inserting all the values you'll get the result.

the solution is 12x-6y

the answer will be the last one