Find the volume of the solid of revolution obtained by rotating the region bounded by
y=x3 and y=x4 about the x-axis.

(a) π/7
(b) π/15
(c) π/35
(d) 2π/35

The line plot below represents the number of letters written to overseas pen pals by the students at the waverly middle school.each x represents 10 students. how many students wrote more than 6 and fewer than 20 letters. a.250 b.240 c.230 d.220