Given δabc, with m∠a = 55° and m∠b = 70°, which of the following descriptions of the triangle are true?

i. acute
ii. obtuse
iii. right
iv. scalene
v. isosceles

select one:

a. ii and iv

b. i only

c. i and iv

d. i and v

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.