Dinh read 20/25 pages, simplified by dividing by common factors this equals 4/5. Because percentages are measured out of 100 divide this number by 5 (the denominator) and you are left with 20. Then divide by 4 (the numerator) and you are left with 80. Therefore, the percentage of assigned pages read equals 80%.
This is even function because 1)the ends are looking in one side, both are up 2)You can see that it has line symmetry y 3) for any point f(x)=f(-x) f(1)=-6 f(-1)=-6
