I hope this helps - it depends what you doing for it to be negative or nonnegative.. :)
Any second part or anything else to look at?
Answer:
y=0.5
Step-by-step explanation:

Check by substitution :

I hope this helps you
30 degree => k
60 degree=> k square root of 3
90 degree=> 2k
sin30=k/2k
sin30=1/2
Answer:
434 liters left
Step-by-step explanation:
5855 - 5421