Answer:
Cosine
Step-by-step explanation:
If the triangle is not right-angled, and there is not a matching pair, you will need the Cosine Rule..
and the formula used will be: 
In the opposite case if the triangle is not right-angled, and there is a matching pair, you will need the Sine Rule..
Answer:
99
Step-by-step explanation:
a p e x
Answer:
-10/7
Step-by-step explanation:
(-5/7)/(2/4) = (-5/7)/(1/2) = (-5/7)*(2/1) = -10/7
Hope i answered correctly, it’s (-7,3) and (-7,-3)