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3 years ago

A large white rectangle represents x, and a small white square represents 1. Choose the question that shows

Mathematics

1 answer:

yarga [219]3 years ago

5 0

3(x+2) means 3 sets, each set contains a x and 2 1's

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Use the place value to add........Estimate then find the sum 519 +347=

Ede4ka [16]

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4 years ago

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What is the image point of (5, 1) after a translation right 5 units and down 2 units?

aleksley [76]

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3 years ago

the mean of a set of numbers is 300. if each number in that set is increased by 5, what is the new mean of this new set of numbe

Vilka [71]

The new mean of set of new numbers is 305

Solution:

Given, The mean of a set of numbers is 300

Each number in that set is increased by 5,

We have to find what is the new mean of this new set of numbers

$\text { mean }=\frac{\text { sum of observations }}{\text { number of observations }}$

Now, let the number of observations be n and observations be $a_{1}, a_{2}, a_{3}, a_{4}, \ldots \ldots \ldots, a_{n}$

$\text { So, mean }=\frac{a_{1}+a_{2}+a_{3}+\cdots a_{n}}{n}$

$a_{1}+a_{2}+a_{3}+\ldots \ldots+a_{n}=m e a n \times n$

$a_{1}+a_{2}+a_{3}+\ldots . a_{n}=300 n$

Now, after each number is increased by 5

$\text { New numbers are }\left(a_{1}+5\right),\left(a_{2}+5\right), \ldots \ldots \ldots\left(a_{n}+5\right)$

$\text { And, new mean }=\frac{\text {sum of new observations}}{\text {number of observations}}$

$=\frac{\left(a_{1}+5\right)+\left(a_{2}+5\right)+\ldots \ldots+\left(a_{n}+5\right)}{n}$

$=\frac{\left(a_{1}+a_{2}+\cdots a_{n}\right)+(5+5+5+\cdots+5(n\text { times)) } }{n}$

$=\frac{300 n+5 n}{n}=\frac{305 n}{n}=305$

Hence, the new mean is 305

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4 years ago

Two lines intersect at exactly 1 point O Sometimes O Always O Never

Hitman42 [59]

Answer:

Sometimes

explanation:

ive already taken this :)

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Aleonysh [2.5K]

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4 years ago