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v1 Algebra, STD2 A1 2010 HSC 24a

Margie tried to solve this equation and made a mistake in Line 2. 

  1. Copy the equation in Line 1. Rewrite Line 2 correcting her mistake.   (1 mark)

  2. Continue your solution showing the correct working for Lines 3 and 4 to solve this equation for .   (1 mark)

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v1 Algebra, STD2 A1 2013 HSC 29a

Jeremy tried to solve this equation and made a mistake in Line 2. 

  
Copy the equation in Line 1 and continue your solution to solve this equation for .

Show all lines of working.   (2 marks)

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♦♦ Mean mark 27%
STRATEGY: The RHS of the equation increases from 1 to 10 (from Line 1 to Line 2), indicating both sides must have been multiplied by 10.

v1 Algebra, STD2 A1 2007 HSC 24b

The distance in kilometres () of an observer from the centre of a thunderstorm can be estimated by counting the number of seconds () between seeing the lightning and first hearing the thunder.

Use the formula    to estimate the number of seconds between seeing the lightning and hearing the thunder if the storm is 2.1 km away.   (1 mark)

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v1 Algebra, STD2 A1 SM-Bank 10

For adults (18 years and older), the Body Mass Index is given by:
  

,    where   mass in kilograms and   height in metres.
  

The medically accepted healthy range for    is  .

What is the minimum weight for a 172 cm adult female to be considered healthy, correct to 1 decimal place? (2 marks)

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