The human body consist 1/10 hydrogen 16/25 oxygen 1/5 carbon

Can someone me with this graph problem by the way i need to know the answers by today since this assignment is due ! !

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

Oliver makes blueberry jam every year. the number of kinds of jam he makes this year can be represented by the expression 4p -9, where p is the number of pints he made last year