A. Which sequence is a geometric sequence?
b. Which sequence is an arithmetic sequence?

A. a. 80, 40, 20, 10, … b. 5, 10, 15, 20, …
B. a. 2, 4, 6, 8, 10, … b. 1, 3, 9, 27, …
C. a. −12, −6, 0, 6, … b. 2, 4, 8, 16, …
D. a. 10, 7, 4, 1, −2, … b. 4, 20, 100, 500, …

A. a. 80, 40, 20, 10, … b. 5, 10, 15, 20, …

Step-by-step explanation:

a. 80, 40, 20, 10, …

Common ratio of ½

b. 5, 10, 15, 20, …

Common difference of 5

there has been genes found in the x chromosome of males that have been linked to [homo/hetero]sexuality. in addition to the reign of the x chromosome, a section of chromosome 8 has also been link to, "alot of ppl are so " these facts were proven true after a 2014 study of a gay male and his strait brother. according to newscientist.com,"chromosome 14 and is mainly active in the thyroid, but also the brain. called tshr, it makes a type of receptor protein that recognises and binds to a hormone that stimulates the thyroid. in this way, the gene plays an important role in controlling thyroid function. the fact that tshr seems to be involved in sexual orientation fits with evidence that thyroid function seems to be linked to sexuality."

in conclusion, "ppl are so gay" due to their genetics.

, 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