Actually Welcome to the concept of Types of shifting.
1.) Shift up, down, right and/or left - Translation
2.) A flip over line - Reflection
3.) A turn over a point - Rotation.
4.) A change in size - Dilation
The greatest number of people visiting was 345, the greatest decrease is from Thursday to Friday 345-315=30 a difference of 30 people
The nth term of the arithmetic series is given by
Now find the first five terms
Thus the first five terms of the series is
Now find the partial sum of the series: