Melody

No you did not fix it!

No, it does not sound dumb. I am quite sure that Chris appreciations your comments just as all answerers do.

If you become a member your appreciation will be more recognized

Members who make a good name for themselves definitely get preferential treatment.

Do you have your output set to present all things enclosed in dollar signs as LaTex?

It does not work that way for most of us.

If you want your latex to present properly you must put it in the LaTex box (found in the ribbon) and you must get rid of the dollar signs.

Don't you even read your responses?

Some are getting flagged automatically. 

They are not readable, not easily anyway.

You should not be asking so many questions anyway. 

It indicates that you just want people to do your homework for you.

AND you should never ask more than one on one post.

Are you even too lazy to present them in a readable format?

Dominator416 has taken offence to your words. He/she has lodged a formal complaint.

But I do not think you have said anything inappropriate (except for your inappropriate mention of a deity.)

The terms of an AP are 

\(T_n=a+(n-1)d\)

a is the first term and d is what keeps getting added to give the next term

for example

if a = -3 and d=5 the sequence would be     -3, 2, 7, 12 etc     see it starts at -3 and 5 keeps getting added.

With yours a is a positive integer and to make it easy d can be too

so the first 10  the sequence is

a, a+d, a+2d, .......a+9d

Add all those terms up and you get   10a+ 1d+2d+3d+4d+5d+6d+7d+8d+9d = 10a+ 45

What can be factorized out of that?

This question has already been done to death.