midnightblack1405 midnightblack1405

03-02-2022
Mathematics

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What is ∑n=17(10n+90) equal to?

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What is n1710n90 equal to Enter your answer in the box class=

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goddessboi goddessboi

03-02-2022

Answer:

910

Step-by-step explanation:

[tex]\sum_{n=1}^{7}(10n+90)\\\\=\sum_{n=1}^{7}(10n)+\sum_{n=1}^{7}(90)\\\\=10\sum_{n=1}^{7}(n)+90(7)\\\\=10(\frac{7(7+1)}{2})+630\\\\=10(28)+630\\\\=280+630\\\\=910[/tex]

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2 m --- = ---- 5 70 5m = 2(70) 5m = 140 m = 140/5 m = 28 This all cant be the answer is it