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15-04-2021
Mathematics

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Find the sum of the first 10 multiples of 9.

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surjithayer10otahza surjithayer10otahza

15-04-2021

Answer:

Step-by-step explanation:

9+18+27+...+90

n=10

a=9

last term l=90

[tex]s_{n}=\frac{n}{2} (a+l)\\s_{10}=\frac{10}{2} (9+90)\\=5 \times 99\\=495[/tex]

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