3 years ago

Please help me thank you

Mathematics

1 answer:

baherus [9]3 years ago

8 0

2/a-1 is 100% the correct answer

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3 years ago

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Part A:

23 + 13x ≤ 81

Part B:

23 + 13x ≤ 81

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3 years ago

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Andreyy89

$\displaystyle\sum_{i=3}^{10}(2i-9)=2\sum_{i=3}^{10}i-9\sum_{i=3}^{10}1$

Recall that

$\displaystyle\sum_{i=1}^n1=n$

$\displaystyle\sum_{i=1}^ni=\frac{n(n+1)}2$

Your sums start at $i=3$ , so in order to apply these formulas directly, you need to compensate for the missing first two terms:

$\displaystyle\sum_{i=3}^{10}1=\sum_{i=1}^{10}1-(1+1)=10-2=8$

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3 years ago

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