How do i know that i am supposed to split it to those two numbers and not 2 other number?

step-by-step explanation:

1. the cylinder is a. 54

2.   a.108 /

, 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

the answer is d

for problems like this theres an app, its photomath that explains the problem and gives the answer hope i

what steps are you having us

step-by-step explanation: