Question

The cost of a hamburger is $2.50. Each additional hamburger costs $2.00. Sully wrote this explicit rule to explain the sequence of costs f(n)2+2.5(n- 1). Using this rule, he found the cost of 12 hamburgers to be $29.50 Is this number correct? If not, identify Sully's error

Answer 1

Yea it correct just plug in 12 where it need to go at in the equation

Answer 2

Sully is correct there is no error.

Explanation:

Given : The cost of a hamburger is $2.50. Each additional hamburger costs $2.00. Sully wrote this explicit rule to explain the sequence of costs
`f(n)=2+2.5(n- 1)`.

To find : Using this rule, he found the cost of 12 hamburgers to be $29.50 Is this number correct? If not, identify Sully's error

Solution :

The cost of a hamburger is $2.50.

Each additional hamburger cost $2.00.

Sully wrote this explicit rule to explain the sequence of costs:

`f(n)=2+2.5(n- 1)`

To find the cost of 12 hamburgers substitute n=12,

`f(12)=2+2.5(12- 1)`

`f(12)=2+2.5(11)`

`f(12)=2+27.5`

`f(12)=29.5`

The cost of 12 hamburgers to be $29.50.

Therefore, Sully is correct there is no error.