Write a number eighteen in another way

Which of the fallowing best completes the sequence 12,8,5, a) 1 b) 2 c)4 d)0

Find x & pleeeeaaaassseeee me !

Consider the integral: 4 0 16 − y2 − 16 − y2 4 1 x2 + y2 dz dx dy . (a) describe w. use the standard view of the x, y, and z axes. front half of a cone with a rounded top. full cone with a flat top. right half of a cone with a flat top. front half of a cone with a flat top. right half of a cone with a rounded top.