Currently having a metal break down someone with more BRAIN CELLS HELP ME(;´༎ຶٹ༎ຶ`)

woah can i join ya jk but i'll try

Step-by-step explanation:

well i was taught  that a negitive in math when is with a positive = a negitive and i'm not so sure but it's probly D  

the fist one is not equalvalent but i think th second one isand the third isnt definetly or the last one is i think. hope this !

step-by-step explanation:

, 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