Hello,
I 'd appreciate help with the below questions :)
1.
2.
3.
+129850 1. The common difference is 33......the first term is 20
So.....the formula is for the number sold in the nth week is
20 + 33 ( n - 1) =
20 + 33n - 33
33n - 13
2. an = -2n + 7
First term is -2(1) + 7 = 5
Second term is -2(2) + 7 = 3
So....the common difference is - 2
So....the recursive rule is an = an-1 - 2
So.....
a1 = 5 an = an-1 - 2
3. 2, 9, 16, 23 , 30
The common difference is 7
The first term is 2
So....the explicit formula for the nth term is
an = 2 + 7 ( n - 1) = 2 + 7n - 7 = -5 + 7n
Thanks, Cphill!
I really struggle with these types of questions, so if you could help with these questions also that would be greatly appreciated!
1st one:
2nd one:
+129850 First one
-2.7, -8.3, -13.9 , -19.5, -25.1
The common difference is -8.3 - (-2.7) = -5.6
The first term is -2.7
So....the recursive rule is
an = an-1 - 5.6 where a1 = -2.7
Second one :
12.5, 11, 9.5.....
The common difference is 11 - 12.5 = -1.5
The first term is 12.5
So....the explicit rule is
an = a1 - 1.5(n - 1) = 12.5 - 1.5n + 1.5 = 14 -1.5n
