When Derek planted a tree it was 36 inches tall. The tree grew 1 1/4 inches per year. The tree is now 44 3/4 inches tall. How many years ago did Derek plant the tree?

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damonteblake12ox4h8g damonteblake12ox4h8g

02-04-2018
Mathematics

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When Derek planted a tree it was 36 inches tall. The tree grew 1 1/4 inches per year. The tree is now 44 3/4 inches tall. How many years ago did Derek plant the tree?

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Аноним Аноним · Answer 1 · 2018-04-02T08:16:29+02:00

Original Height = 36 inches.

Change in height:

[tex]44\dfrac{3}{4} - 36 = 8\dfrac{3}{4} [/tex]

Number of years :

[tex]8\dfrac{3}{4} \div 1\dfrac{1}{4} [/tex]

[tex]=\dfrac{35}{4} \div \dfrac{5}{4} [/tex]

[tex]=\dfrac{35}{4} \times \dfrac{4}{5} [/tex]

[tex]=7[/tex]

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Answer; Derek has planted the tree for 7 years.
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