What are the max/min values of the following equation? y = 2x3 – 2x² – 18x + 18

Someone please help me out

12 out of 30 people chose their favourite colour as blue caculate the angle you would use for blue on a pie chart

I'm marking the brainliest and it's 15 points

Nour and rana are shopping for a christmas tree. they are deciding between 2 22 different types of trees (real and fake) and 4 44 colors for the ornaments (white, silver, gold, and purple). they each created a display to represent the sample space of randomly picking a type of tree and a color for the ornaments. whose display correctly represents the sample space?