HELP with 3 questions WILL GIVE A MEDAL!

Question

anonymous · Answer

Is the sequence arithmetic? If so, identify the common difference. 

13, 20, 27, 34, ...

zehanz · Answer

In an arithmetic sequence, the difference between consecutive terms is always the same.

anonymous · Answer

I just wanted to let u know i got the last two!
I will erase them

zehanz · Answer

ALL THIS WORK FOR NOTHING??? :(

–7 , 3, 13, 23, ... is arithmetic.

Think of a.s.'s as linear equations. (with straight line as graph). Same thing is happening here.
Even the same kind of formula: 

If a is the name of the sequence, then a(n)=p*n+q is a formula for it.

Here we have: 

n    =  0, 1, 2,    3
a(n)=-7, 3, 13, 23

First, the number q: that is a(0), so it is -7
Second, the number p: that is the constant increase you get every time, so it is 10.

Formula: a(n)=10n-7

zehanz · Answer

Just kidding ;)

anonymous · Answer

thanks so much! i really apperciate you help!

anonymous · Answer

*your

zehanz · Answer

YW!