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Question
At age of 2 years, a cat or a dog is considered 24 “human” years old. Each year, after age 2 is equivalent to 4 “human” years. Fill in the expression [24 + 
(a – 2)] so that it represents the age of a cat or dog in human years. Also, you need to determine for what ‘a’ stands for. Copy the chart and use your expression to complete it.
| Age | [24 +  (a – 2)] |
Age (Human Years) |
| 2 | ||
| 3 | ||
| 4 | ||
| 5 | ||
| 6 |
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Solution
The expression is [24 + 4(a – 2)]
Here, ‘a’ represents the present age of dog or cat.
| Age | [24 + 4 (a – 2)] | Age (Human Years) |
| 2 | [24 + 4(2 – 2)] | 24 |
| 3 | [24 + 4(3 – 2)] | 28 |
| 4 | [24 + 4(4 – 2)] | 32 |
| 5 | [24 + 4(5 – 2)] | 36 |
| 6 | [24 + 4(6 – 2)] | 40 |
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