Algebra I am having a major brain fart

9)The nth term of an arithmetic sequence with first term a1 and common difference d is given by fn=a1+(n-1)d, where n is a positive integer.

fn=a1+(n-1)d

fn=0+(n-1)3

fn=3n-3

This function is Nonproportional.

check to see if (0,0) is on the graph.

fn=3n-3

0=3(0)-3

0=0-3

0=-3

10) an=a1+(n-1)d

an=-4+(n-1)(4)

an=-4+4n-4

an=4n-8

This function is Nonproportional

check to see if (0,0) is on the graph.

4(0)-8=-8

So, the line does not contain (0,0)

11) The equation is Y=2.25x+2.50.

12)

A) An=a1+(n-1)d

an=1.65+(n-1)1.65

an=1.65+1.65n-1.65

an=1.65n.

B)As the number of hours increases from hour to hour the inches of snowfall also increases at a constant rate. This means that the relation is proportional.

i think it is

step-by-step explanation:

a formal letter is a letter the you would send to a king

tube or goog would be a great resource to with that question