Need help with 14!!! Please show ur work.My teacher is a Karen soooo yeah! Have a nice day

Mathematics

2 answers:

zvonat [6]3 years ago

8 0

2.5 inches is 15 miles so if it’s 4 inches on the map it would be 27 miles cuz each half inch is 3 miles. 3x9=27

UkoKoshka [18]3 years ago

7 0

Answer:

A) 24 miles

Step-by-step explanation:

15/2.5 = 6 miles per inch

(6)(4) = 24 miles

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What is the sum of the geometric series

lbvjy [14]

If $S$ denotes the sum of the first $n$ terms of a geometric series with first term $a$ and common ratio $r$ , then

$S=a+ar+ar^2+\cdots+ar^{n-3}+ar^{n-2}+ar^{n-1}$
$rS=ar+ar^2+ar^3+\cdots+ar^{n-2}+ar^{n-1}+ar^n$
$\implies S-rS=a+(ar-ar)+(ar^2-ar^2)+\cdots+(ar^{n-1}-ar^{n-1})-ar^n$
$\implies (1-r)S=a(1-r^n)$
$\implies S=a=\dfrac{1-r^n}{1-r}$

Using summation notation, you have

$S=\displaystyle\sum_{x=1}^nar^{x-1}=\sum_{x=0}^{n-1}ar^x=a\dfrac{1-r^n}{1-r}$

In this case, you have $a=2$ , $r=\dfrac12$ , and $n=16$ . So the value of the sum is

$\displaystyle\sum_{x=0}^{15}2\left(\frac14\right)^x=2\dfrac{1-\left(\frac14\right)^{16}}{1-\frac14}\approx2.67$

Rounded to the nearest whole number, the answer would be 3.

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3 years ago

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Leviafan [203]

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3 years ago

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MakcuM [25]

Answer:

Step-by-step explanation: