Suppose you are a settler in the British colonies. You want to settle on land where the Ohio River meets the Mississippi River. What physical feature do you have to cross to reach
that area?

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Ответ:

hannahdrees0731

15.03.2021

Social Studies

a₁₈ = - 31

Step-by-step explanation:

$S_{10}=\dfrac{2a_1+d(10-1)}{2}\cdot 10\\\\\dfrac{2a_1+9d}{2}\cdot 10=-60\\\\\dfrac{2a_1+9d}{2}=-6\\\\2a_1+9d=-12\\\\2a_1=-12-9d\\\\\\S_{15}=\dfrac{2a_1+d(15-1)}{2}\cdot 15\\\\\dfrac{2a_1+14d}{2}\cdot 15=-165\\\\\dfrac{2a_1+14d}{2}=-11\\\\2a_1+14d=-22\\\\-12-9d+14d=-22\\\\ 5d=-10 \\\\ d=-2\\\\\\2a_1=-12-9(-2)=-12+18=6\\\\a_1=3\\\\\\ a_{18}=a_1+17d=3+17(-2)=3-34=-31$

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Suppose you are a settler in the British colonies. You want to settle on land where the Ohio River meets the Mississippi River. What physical feature do you have to cross to reach that area?