That's the period at the end of the sentence written in
million-point font across the Sahara.
(It's an ad placed there by McDonald's to attract the
18-30 alien demographic.)
2:4
basically you are doubling the ration because it is 2:4
5:10
Your answer would be 0.875.
<span>let y=sin theta = 0, as shown in the figure, when y=0, there are 5 values of theta, -2Pi; -Pi 0 Pi 2Pi</span>