Answer:
It would be an arithmetic sequence.
Step-by-step explanation:
This is because during each minute, he does another 2 problems. Or, in other words +2 each minute.
This is the result of the sequence during each minute:
(Problems Left): <em>30, 28, 26, 24, 22... 0</em>
Time (Minutes) --->
If it was instead a geometric equation, it would go by a multiple, such as the number 2. Or, ×2 each minute.
During the first minute, he learns 2 problems. But then as each minutes passes it turns into 4, then 8, and etc..
This is the result of the pretend sequence during each minute: (Problems Left): <em>30, 28, 24, 16, 0</em>
Time (Minutes) --->
The formula would be for this equation would follow
an = a1 + (n-1)d
an is your result.
a1 is the first number you plug in
(n-1) is just there, don't mind it (aka: the term position).
and d is the rate.
So just plug them in from your equation, and you would get this:
an = 30(n-1)2
and 
, if 
is an arithmetic sequence, then the common difference between successive terms is 
.
th term is