Hello. you shouldn't have people do your work full at a time.
8
(4/5)* 10= 8
if you divide 10 by 5 then you have 2 and then multiply it with 4 and you have 8.
Hope this helps:)
Probability of spinning a C =1/4
Probability of flipping heads = 1/2
1/4*1/2 = 1/8
Maybe use a ruler To find the area and add them together to fin the volume.