IF you are using an online calculator, then use this input.
acos(-1)
what is the unit of that number?
(2a-2a)+(4b-3b)= 0a+1b = b
Just take the eigth root of the 40.$${\sqrt[{{\mathtt{{\mathtt{8}}}}}]{{\mathtt{40}}}} = {\mathtt{1.585\: \!833\: \!175\: \!137\: \!243\: \!4}}$$
X=1.585
multiply the number of attendence by percentage to find the number of people who ordered chicken.
120*(65/100)=78 people ordered chicken.
D=sqrt((x2-x1)^2+(y2-y1)^2)
D=sqrt((7-6)^2+(3-7)^2)
Distance= 4.12
