Please help me with this!!

The number of 8th graders who responded to a poll of 6th grade and 8 th graders was one fourtg of the number of 6th graders whi responded if a total of 100 students responddd to the poll how many of the students responded were 6 th graders

Geometry - finding area of regular polygons and sectors (check my math, i can’t find the error)

How many and of which kind of roots does the equation f(x)=2x^4−9x^3+17x^2−16x+6 have?