Question

Write an expression for each of these situations. You can choose your own letters, but make sure you write what your letters represent.

The total cost of seven drinks and six bags of potato chips.

The total value of three rings is doubled.

Answer 1


`7d+6b`

`6r`

Explanation:

let
`d` be the cost of a drink

let
`b` be the cost of a bag of potato chips

and let
`r` be the cost of a ring

`7d` is the cost of seven drinks

`6b` is the cost of 6 bags of potato chips

so we add them together to get
`7d+6b`

`3r` is the cost of three rings

`2(3r)` is the cost of three rings but doubled

we can expand this to
`6r` which is the cost of 6 rings (or the cost of two rings but doubled)