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My name is Ann [436]

2 years ago

9

On friday, 84% of the people who went to a cafe and ordered coffee. there were 325 people who went to the cafe. how many of thes

e 325 customers bought coffee?

2 answers:

alekssr [168]2 years ago

8 0

273 of the customer bough coffee because 84% of 325 is 273.

bonufazy [111]2 years ago

3 0

273 >3 hopefully this helps you, stay safe !

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2. Determine the sum of the first 400 ODD numbers.<br><br>

il63 [147K]

Odd numbers take the form $2n-1$ , where $n\ge1$ is an integer. When $n=400$ , the last odd number would be 799. So we're adding

$S=1+3+5+\cdots+795+797+799$

By reversing the order of terms, we have

$S=799+797+795+\cdots+5+3+1$

and we can pair up terms in both sums at the same position to write

$2S=(1+799)+(3+797)+(5+795)+\cdots(795+5)+(797+3)+(799+1)$

so that we are basically adding 400 copies of 800, and from there we can find the value of the sum right away:

$2S=400\cdot800\implies S=160,000$

###

We could also make use of the formulas,

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

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

We have

$S=\displaystyle\sum_{i=1}^{400}(2i-1)=2\sum_{i=1}^{400}i-\sum_{i=1}^{400}1=400(400+1)-400=400^2=160,000$

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3 years ago

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Ludmilka [50]

Answer:

Its the one on the left

Step-by-step explanation:

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2 years ago

Which of the following is equivalent to - 2 + 3y = -6?

scZoUnD [109]

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3 years ago

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3 years ago

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