Because 1/4 is a fractional number, it is also a ratio which means it is Rational. :)
8+(-10) is like 10-8 except backwards so how i do some problems is like that and then add a negative sign; so say if i were doing 8+(-10), i would do 10-8 which equals 2 and then since 10 is bigger than 8 and it’s a negative number, i would put -2 as my answer
The formula of a volume of a cone:

We have:

Substitute:

Answer: 1206 cm³