If is a negative number, which of the following is true?

1.   is always negative.
2.   is always negative.
3.   is always negative.
4.   is always negative.

A triangle has a base of length metres and a perpendicular height of  metres.

Write an expression for the area of the triangle.  (2 marks)

A rectangle has sides of  metres and  metres in length.

1. Write an expression for the perimeter of the rectangle.  (1 mark)
   

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2. Write an expression for the area of the rectangle.  (2 marks)
   

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A square has sides centimetres in length.

1. Write an expression for the perimeter of the square.  (1 mark)
   

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2. Write an expression for the area of the square.  (2 marks)
   

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At the local markets mangoes cost and oranges cost .

Benji bought 6 mangoes and 5 oranges. Write an expression for the total cost of Benji's mangoes and oranges.  (2 marks)

Juan bought 8 identical Christmas presents online for his relatives.

1. Write an expression for the total price in dollars, if the cost of each present is .  (1 mark)
   

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2. When he goes to the checkout Juan discovers that all the presents were reduced in price by $10 each.
    
   i.    Write an expression for the reduced price of one present.  (1 mark)
   

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   ii.   Write an expression for the total reduced price of all 8 presents.  (2 marks)
   

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Rachel works as a waiter and is paid $27 per hour.

Write an expression for her wages in a week where she works hours.  (1 mark)