Speak in English please. I would be more pleased to help if you write in English.
Answer:
Plot[-1 + 3^Surd[x, 3], {x, -20, 28}]
90. Add the zero in front of the 9.
Its max is 780
2/3 + 1/6 = 5/6
650/5=130
650+130=780
20%, because if 65 is 100, then 52 is 80% out of 65; so 100 - 80 is 20
