Also does anyone know if there is a website or calculator that may give me the answers? Please help me! Thank you!

Step-by-step explanation:

(alternate exterior angles are congruent when a transversal cuts across two straight lines)

(collecting like terms)

(dividing both sides by -1)

, 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