Yes and you can say more x€ (-inf;15)
Answer:
V = 628
Step-by-step explanation:
Formula to find volume(V) of cone:

Negative
basically
negative means change sign
positive means do nothing
change sign times do nothing=change sign=negative
basically
(+)(+)=(+)
(-)(-)=(-)
(+)(-)=(-)
(-)(+)=(-)
and
(+)/(+)=(+)
(-)/(-)=(-)
(+)/(-)=(-)
(-)/(+)=(-)
answer is negative
Noah is right because 75% of 10 is 7.5 and 10% of 30 also equals 7.5