Create a summary sheet with an input cell that allows a user to indicate a supplier. You decide where to put this, but make it an obvious input cell. Display how many items are provided by the selected supplier.
Show the average "Lastname Cost" for ONLY the items provided by the selected supplier.
Create four labels representing each of the four shipping types. NOTE: Your first name is now a shipping type instead of “Optional.”.

arithmetic sequence

step-by-step explanation:

given that a sequence has terms as

19, 15, 11,

this is represented on a graph

the pattern indicates that the sequence is an arithmetic sequence with i term

a=19 and common difference d =-4

any general term

thus the sequence is reduced by 4 for each successive term starting from 1 and nth term is

24-5n.

first negative term would start after 5th term

5th term =24-25< 0

from 5th term onwards the sequence would be negative.

goog may have it for you

if x = 1, then the answer is 3.5