Please help I really need help !!

x=24

Step-by-step explanation:

x+156=180

x=24

24 degrees

Step-by-step explanation:

Line AOC is an angle that is 180 degrees so if one side of the angle is 156 we subtract 156 from 180 and we get 24

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for