All categories

4 years ago

Plz help I will mark you brainlist plz

Mathematics

2 answers:

Natalka [10]4 years ago

8 0

Answer:

The answer is x = 2 for question 2, and r = 2 for question 4.

Step-by-step explanation:

4x + 6 + 3 = 17

(combine like terms)

4x + 9 = 17

(subtract 9 on both sides)

4x = 8

(divide 8 by 4)

x = 2

r + 11 + 8r = 29

(combine like terms)

9r + 11 = 29

(subtract 11 on both sides)

9r = 18

(divide 18 by 9)

r = 2

vodka [1.7K]4 years ago

4 0

2. x=2

4x+6=14

-6. -6

4x=8

4x/4.= 8/4

x=2

4. r=2

r+11+8r=29

-11. -11

r+8r=18

9r=18

9r/9 = 18/9

r=2

Hope this helps.

You might be interested in

WIL GIVE BRAINLIEST!

Grace [21]

Answer: 4x - 13

<h2>Step-by-step explanation: </h2>

<em>First, we need to get triple of x:</em>

Triple of x is: 3x

<em>Next is to get the difference between 3x and 13:</em>

x + 3x -13

4x - 13

Hence, the variable expression is 4x - 13

5 0

3 years ago

Find the variance of the following data. Round your answer to one decimal place. x 1 2 3 4 5 P(X=x) 0.3 0.2 0.2 0.1 0.2

Reptile [31]

The variance of a distribution is the square of the standard deviation

The variance of the data is 2.2

<h3>How to calculate the variance</h3>

Start by calculating the expected value using:

$E(x) = \sum x* P(x)$

So, we have:

$E(x) = 1 * 0.3 + 2* 0.2 +3 * 0.2 + 4 * 0.1 + 5 * 0.2$

This gives

$E(x) = 2.7$

Next, calculate E(x^2) using:

$E(x^2) = \sum x^2* P(x)$

So, we have:

$E(x^2) = 1^2 * 0.3 + 2^2* 0.2 +3^2 * 0.2 + 4^2 * 0.1 + 5^2 * 0.2$

$E(x^2) = 9.5$

The variance is then calculated as:

$Var(x) = E(x^2) - (E(x))^2$

So, we have:

$Var(x) = 9.5 - 2.7^2$

$Var(x) = 2.21$

Approximate

$Var(x) = 2.2$

Hence, the variance of the data is 2.2

Read more about variance at:

brainly.com/question/15858152

4 0

2 years ago

Which numbers round to 0.8 when rounded to the nearest tenth?

patriot [66]

E because, as it says "5 below, shove it below, 5 and up, shove it up"

(give brainliest pls)

3 0

3 years ago

Read 2 more answers

In Hillcrest School, 36% of middle school students are in Grade 6, 31% are in grade 7, and 33% are in grade 8.

svetlana [45]

Answer:

D) 0.67

Step-by-step explanation:

Just took the test te only one i got wrong because i put C)0.64

5 0

4 years ago

Read 2 more answers

The size of a certain cell is2.5×10^-9m another cell is 1.5×10^3 times larger how large is the cell in scientific notation

Ludmilka [50]

The answer is <span>2.5 × 10⁻⁹ × 1.5 × 10³ = 3.75 × 10⁻⁶ </span>

8 0

3 years ago

Plz help I will mark you brainlist plz ​

Plz help I will mark you brainlist plz