And the last answer is aslyn did not substitute the correct value for the height in the formula 100 points

step 3

Step-by-step explanation:

Step-by-step explanation:

I think the answer will be step 3

, 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

hope this is what you were asking for!

step-by-step explanation: