Please help- will give brainlist. I would appreciate if you told me how you got the answer but you don’t have to

9 x 15 = 135. Just width times height.

Just multiply 9 by 15 and that’s the answer

Step-by-step explanation:

9x9= 81

15x15=225

225+81= 306

answer: no, but if it does it's a obvious pattern.

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