Can you help me find the value of a

In equilateral triangle all angles and sides are equal, that means all the angles will be 60 degree

Step-by-step explanation:

3a-3=60degree

3a=60+3=63

a=63/3=21

The value of a =21

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.

the answer is 62