EXPLANATION
Given the sequence:
C. 3, 12, 27, 48, 75
First, we need to calculate the difference between terms:
12-3 = 9 27-12 = 15 48-27 = 21 75 - 28 = 27
Arithmetic relationship: 9, 15 , 21, 27
To obtain the sequence we use the following formula:
Now, we need to calculate the appropriate difference between terms:
15-9 = 6 21-25 = 6 27 - 21 = 6
So the constant difference is 6 and the nth term will be:
nth = 6n + 3
*a1=3
So, the relationship will be:
n Value Relationship
1 12 3 + (6*1 +3)
2 27 12 + (6*2 + 3)
3 48 27 + (6*3 + 3)
4 75 48 + (6*4 + 3)
5 108 75 + (6*5 + 3)
n n-1 + (6n+3) n-1 + (6n+3)
Explicit function: y = (n-1) + (6n+3)