assuming the fraction is 1/11, the denominator shows how many parts the WHOLE was sliced into, namely 11 parts.
The middle two. An arithmetic series is when something is added over and over again. Geometric is the same except multiplication. For the first one, it only adds 3. For thr last one, it multiplies by -3. For the middle two, I can't seem to find a pattern.
20% decrease Z z. Z xx. X
Find the distances of each plane for the 4 hours, then use the law of cosine.
See attached picture: