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A school water tank is being emptied at a steady rate. The table shows the water left after each hour. Which rule gives the litres left after h hours?

Class 7Formulas and Rules from PatternsAlgebra
  • A
  • B
  • C
  • D

Step-by-Step Solution

It starts at 500 L and loses 30 L every hour: 500 − 30h. Check h = 3: 500 − 90 = 410 ✓.
Answer: D)

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