7. A foresting service conducted a survey to see if tree forms that planted hardwood trees were more profitable over a 30-year period than tree farms that planted softwood trees.
The results of this study showed that hardwood trees had a 46% higher profit per acre. Are the results statistically significant?

, 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

333.74 ! should be your answer for this question