Fiona is drawing polygons on a computer. she wants to map a regular 9-sided polygon back onto itself using a reflection. which set of lines can fiona choose from for her line of reflection?
a. any line passing through the center of the polygon
b. any perpendicular bisector of one of the sides
c. any line joining the midpoints of any two sides
d. any line parallel to a side of the polygon

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.

answer: for each 3 girls there is 2 boys . 3: 2

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