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3 years ago

What is the sum of all odd integers between 8 and 26

Mathematics

2 answers:

Andru [333]3 years ago

8 0

Odd integers between 8 and 26
{ 9,11,13,15,17,19,21,23,25}...added = 153 <==

Rama09 [41]3 years ago

4 0

It's an arythmetic sequence:

$a_1=9;\ d=2;\ a_9=25\\\\S_n=\dfrac{a_1+a_n}{2}\cdot n\\\\S_9=\dfrac{9+25}{2}\cdot9=\dfrac{34}{2}\cdot9=17\cdot9=153\\\\Answer:\boxed{153}$

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Evaluate the following expressions: 2(−1 + 3) − 7

Svetach [21]

Answer:

-3 is the answer.

Step-by-step explanation:

=2(-1+3)-7

=2(2)-7

=4-7

=-3

Hope it will help you :)

7 0

2 years ago

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faltersainse [42]

The price of one vegetarian special lunch is $7 and price of one chicken special lunch is $8.

Step-by-step explanation:

Let,

Price of one vegetarian special lunch = x

Price of one chicken special lunch = y

According to given statement;

21x+40y=467 Eqn 1

28x+36y=484 Eqn 2

Multiplying Eqn 1 by 28

$28(21x+40y=467)\\588x+1120y=13076\ \ \ Eqn\ 3$

Multiplying Eqn 2 by 21

$21(28x+36y=484)\\588x+756y=10164\ \ \ Eqn\ 4$

Subtracting Eqn 4 from Eqn 3

$(588x+1120y)-(588x+756y)=13076-10164\\588x+1120y-588x-756y=2912\\364y=2912$

Dividing both sides by 364

$\frac{364y}{364}=\frac{2912}{364}\\y=8$

Putting y=8 in Eqn 1

$21x+40(8)=467\\21x+320=467\\21x=467-320\\21x=147$

Dividing both sides by 21

$\frac{21x}{21}=\frac{147}{21}\\x=7$

The price of one vegetarian special lunch is $7 and price of one chicken special lunch is $8.

Keywords: linear equation, elimination method

Learn more about elimination method at:

#LearnwithBrainly

5 0

2 years ago

A set of quiz scores is shown in the histogram below. The mean of the data set is 20.2, and the (population) standard deviation

Neko [114]

Answer:

$13$

Step-by-step explanation:

As the mean is 20.2 and the standard deviation is 2.4

The range within the first standard deviation is

(17.8,22.6)

This means that we can safely use the range of (18,22) as we cannot confirm whether the other values fall within the range.

Within this range there are

$2+3+4+3+1=13$

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2 years ago

Write the fraction or mixed number as a percent.<br> 1 21/50 =

Eddi Din [679]

242% should be the answer

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2 years ago

Read 2 more answers

Can anybody help me with the question in the attachment please?<br>(will mark brainliest)

PIT_PIT [208]

Answer:

8/12 and 4/12

Step-by-step explanation:

simplified to 2/6 and 1/6

3 0

2 years ago