Expressing missing number problems algebraically

Maths

Calculation problems

Which expression would represent the following problem:  The cooking time for roast beef is 30 minutes for every kg plus an additional 15 minutes.

Which expression would represent the following problem:  The cost of a photo album book is £2.50 for binding and printing with an additional cost of 15p per photograph.

Which expression would represent the following problem: A singer makes money from selling music. They pay a one-off fee of £25.00 to Oak-Tunes for marketing and distribution costs and receive 55p for each copy of the album sold.

Instead of writing 5 x a in an algebraic expression, what could I write instead?

How could we express the perimeter of the rectangle below?

How could we express the perimeter of the square below?

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