If a=5 and b=8. work out the value of the following:
3a + 5b -2 + 7
5a + 7b- 7 + b'
multiply out the following brackets:
4f (8 + g) - 10f
8n (3m + 8n) + 2n"

2. a) 60 b) 99
I do not not remember how to do the last 2 parts

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.