18/30 simplifies into 6/10 which then is put in decimal form of 0.6
Step-by-step explanation:
sina = -√3/2




=±1/2
Since, π<a<3π/2
cos a = -1/2


OptionB
Answer:
b
20
10
Step-by-step explanation:
Answer: I think that it's -125/27
Step-by-step explanation: Convert into a complex fraction (-5/3)^3 and then cube the 5 and 3 and don't change the negative sign. The answer then is -125/27
Hope it helps.