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# 2. When giving an explicit rule, which answer BEST describes how it should look?

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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

Feb 11, 2021

### 1+0 Answers

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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  }   Feb 11, 2021