$\"\"$

A studio charges sitting fee of $\"\"$ plus $\"\"$ for each portait sheet ordered.

Write an algebraic expression find the total cost to have photographs taken.

Phrase: Studio charges sitting fee of $\"\"$ plus $\"\"$ for each portait sheet ordered.

Variable: Let $\"\"$ represents the number of portait sheet ordered.

Expressions: $\"\"$ .

Therefore, the algebraic expression for total sheet is $\"\"$ .

$\"\"$

Find the cost of purchasing twelve portraits sheets.

$\"\"$ (Original expression)

$\"\"$ (Substitute $\"\"$ )

$\"\"$ (Multiply: $\"\"$ )

$\"\"$ (Add: $\"\"$ )

Therefore, the cost of purchasing twelve portraits sheets is $\"\"$ .

$\"\"$

The algebraic expression for total sheet is $\"\"$ .

The cost of purchasing twelve portraits sheets is $\"\"$ .