Answer is a.
Due to BIDMAS/BODMAS
anything that is first, in this case division, goes into brackets.
6 divided by 3 would go into brackets making you solve that first then u would subtract your answer by 12 making your answer 4
Answer is a.
a.
162 is not a perfect square therefore you have to find the largest perfect square that can go into 162 which would be 81.
Answer:



[since in third quadrant cos 30=-![\frac{\sqrt{3}}{2}]](https://tex.z-dn.net/?f=%20%5Cfrac%7B%5Csqrt%7B3%7D%7D%7B2%7D%5D)

:150°or 
<u>150°</u><u>or</u><u> </u>
<u>is</u><u> </u><u>a</u><u> </u><u>required</u><u> </u><u>answer</u><u>.</u>