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Question
Subtract:
2a2 from − 7a2
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Solution
\[- 7 a^2 - \left( 2 a^2 \right)\]
\[ = - 7 a^2 - 2 a^2 \]
\[ = - 9 a^2\]
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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 |
