3(d – 4) + 1 = 10 what does d equal?

Iam pretty sure its a sorry if im wrong

Hello! i hope this
since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.