Finding Arithmetic Function Rules

Finding Arithmetic Function Rules

5, 9, 13, 17.....

Find the Arithmetic Rule (need A1 and d)

5, 9, 13, 17.....

 $A_n=5+4\left(n-1\right)$  

15, 12, 9, 6....

Find the Arithmetic Rule (need A1 and d)

15, 12, 9, 6....

 $A_n=15-3\left(n-1\right)$  

The first row in a theater has 40 seats, the next row has 42 seats, then 44 seats and so on.

Find the Arithmetic Rule (need A1 and d)

40, 42, 44...

 $A_n=40+2\left(n-1\right)$  

You start a savings account with $500. Your plan is to deposit $50 at the end of each month.

Find the Arithmetic Rule (need A1 and d)

550 is then end of 1st month.

550, 600, 650, 700....

 $A_n=550+50\left(n-1\right)$  

Multiple Choice

Write the explicit formula for the sequence shown below.

3, -3, -9, -15

• a_n=3+6(n-1)

• a_n=3−6(n-1)

• a_n=6−3(n-1)

• a_n=6+3(n-1)

Multiple Choice

What will be the length if there were 20 grocery carts? (Hint: Find explicit rule first)

• 98 inches
• 266 feet
• 266 inches
• 98 feet

Multiple Choice

Write the explicit rule for this situation.

• f(n) = 35 + 3(n − 1)
• f(n) = 35 −3(n − 1)
• f(n) = 3 + 35(n − 1)
• f(n) = −3 + 35(n − 1)