2. When giving an explicit rule, which answer BEST describes how it should look?
A. It should be an equation.
B. It should be in Standard Form
C.It should be simplified.
D.All of the above are true.
3. {99, 90, 81, ...} What is the explicit rule?
4. {50, 25, 12.5, ... } What is the explicit rule?
PLEAsE HELP! MY TEACHER WILL ASk ME PROBLEMS OF THIS TYPE THIS EVENING
+130071 2. I would say, D
3. Arithmetic
Common difference, d , = -9
First term = 99
Explicit rule
an = 99 - 9 (n - 1) where an is the nth term
Note that this also could be written as
an = 108 - 9n (depending upon the form your teacher wants )
4. Geometric
Common ratio = 1/2
First term = 50
Explicit rule
an = 50 (1/2)^(n -1) where an is the nth term
{The most important thing is to recognize if we have an arithmetic or a geometric series }
