(need on geometry w/pic )

17. find the measure of the size of an equilateral △pqr if pq = 5x - 7 and pr = 2x + 5.

18. in △abc, what is the angle opposite ab ?

In the attached file

Triangle of question 18 isn't visible

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.

c

step-by-step explanation:

i think because what else can be a sample of every member