Mathematics College

3x + 6 = -9 What is X?

Answers

Answer 1

Answer:

x=-5

Step-by-step explanation:

3x+6=-9

-6 -6

3x=-15

x=-5

Answer 2

Answer:

= − 5

Step-by-step explanation:

The steps are in the (2) pictures below. Hope this helps!

Related Questions

plz help I need help on math plz help the first one get bainys its actually for my lis sis

here is my picture

Answers

Answer:

Step-by-step explanation:

1. $5

2. 50 cents

3. 25 cents

4. 3 dollars

5. 70 cents

just subtract them

Solve the system of equations x – 3y = 1 and 2x + 2y = 18 by combining the

equations.

Answers

X = 7 and y = 2; the following photo below is how I solved this problem! Sry if you can’t read my handwriting! Hope this helps!

5.5 + n = 10 please help

Answers

Answer:

n = 4.5

Step-by-step explanation:

10 - 5.5 = n

Answer:

I feel like its 4.5

Step-by-step explanation:

Please help please help
This is a quadratic function and I have to use a square roots method please help me

F(x)=3x^2+7x-20

Answers

Answer:

the answer can be 1.667 or -4

helpppppppppppppppppp

Answers

Answer and Step-by-step explanation:

The independent variable is m, and the dependent variable is h.

This is because you can plug in any value for m, making m NOT have to depend on any other value to become m.

With h, it needs the result of m and its other values to become the result of h. H relies/depends on the values in the equation to become a value.

#teamtrees #PAW (Plant And Water)

Urgent!Math help!!! What’s the real answers?

Answers

Answer: you got the two right, the third is incorrect and the fourth is correct

Step-by-step explanation: I took the quiz hope I pulled some weights off your shoulders

the ratio of the angle measures of a pentagon is 4:5:3:8:7. what is the measure of the smallest angle. help pleasee

Answers

The measure of the smallest angle is 60

Answer:

geometry

The ratio of the angle measures of a pentagon is 4:5:3:8:7. What is the measure of the smallest

The sum of the interior angles of a pentagon is 180(5-2) = 540º

4x + 5x + 3x + 8x + 7x = 540

solve for x and sub into 3x

Which is the graph of y=-x-3?

Answers

Either graph A or C, i'm leaning more towards A

Step-by-step explanation:

because slope is 3/4 and y-intecept is (0,-3)

In a class of 6, there are 2 students who forgot their lunch.
If the teacher chooses 2 students, what is the probability that both of them forgot their lunch?

Answers

1/15 would be your answer.

Answer: 2/6*1/5= 2/30= 1/15

Explanation: The probability that both of them forgot their lunch is 1/15.

Hope this helps (:

find the unknown sizes of angle in the following figures

Answers

Answer:

each missing angle is 120°

Step-by-step explanation:

What you have is a kite so the two missing angles are equal.

The sum of all four angles = 360°

2y = 360° - 88° - 32° = 240°

y = 120°

Andrea receives a $40 gift card to use at the roller skate rink. It costs her $8 per visit to skate. Write a function relating the value of the gift card, v, in terms of the number of visits,n

Answers

Answer:

its b

Step-by-step explanation:

Answer:

Step-by-step explanation:

A radio that costs $29.49 was marked up by 35%

Answers

Answer:

the new price of the radio is $39.81

Step-by-step explanation:

multiply the cost by the mark up to find how much the price was raised by

29.49•0.35= 10.32

then add the mark up to the original price

10.32+29.49= $39.81

and I rounded to the hundreds place because it's money

hope this helps babe <3

Answer:

I think it is $21.84

Step-by-step explanation:

An electronic device factory is studying the length of life of the electronic components they produced. The manager selects two assembly lines and takes all samples on those two lines. He got a sample of 500 electronic components and records the length of life in the life test. A histogram indicates that the lifespans have moderate right skew. From the sample he found the average length of life was 200,000 hours and that the standard deviation was 1,000 hours. He wants to find the confidence interval for the average length of life of the electronic components they produced. Based on the information, what advice will you give to him

Answers

Answer:

The confidence interval will be given by:

[tex]200000 \pm 44.72z[/tex], in which z is related to the confidence level.

For a confidence level of x%, z is the value in the z-table that has a pvalue of [tex]1 - \frac{1 - z}{2}[/tex]

Step-by-step explanation:

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean [tex]\mu[/tex] and standard deviation [tex]s = \frac{\sigma}{\sqrt{n}}[/tex].

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

In the context of this problems:

It means that the sampling distributions of the sample mean of 500 components will be approximated normal, with mean 200,000 and standard deviation [tex]s = \frac{1000}{\sqrt{500}} = 44.72[/tex]

To build the confidence interval:

The confidence interval for the average length of life of the electronic components they produced will be given by:

[tex]200000 \pm 44.72z[/tex], in which z is related to the confidence level.

For a confidence level of x%, z is the value in the z-table that has a pvalue of [tex]1 - \frac{1 - z}{2}[/tex]

The graph of a sine function is shown. Plot the line that represents the midline of this periodic function.

Answers

Answer: The midline should be a horizontal one, at y=4

Step-by-step explanation: See above answer.

Midline of the periodic function given in the picture will be y = 4.

Mid-line of the periodic function: Midline of a periodic function is the line located half-way between the maximum and the minimum values.

From the graph attached in the question,

Maximum value of the periodic function → y = 5

Minimum value of the function → y = 3

Midline of the function → [tex]y=\frac{3+5}{2}[/tex] ⇒ y = 4

Therefore, midline of the periodic function given in the picture will be y = 4.

Learn more about the midline of the periodic function here,

https://brainly.com/question/11749227?referrer=searchResults

2/7 of 49
fractions

Answers

Answer:

Step-by-step explanation

Please help me with the math please?

Answers

Answer:

count how many flowers there are on number 1

Answer:

okay so 3. equals 20

4. 1st one 2nd one 3rd one equals 30

5. first one 2nd one 3rd one equals 30

6. first one second one equals 20

7. first one second one equals 20

Step-by-step explanation:

There is a theory that children wearing superhero costumes are more likely to harm themselves because of the unrealistic impressions of invincibility that these costumes could create. Below there is data about the severity of injury (on a scale from 0, no injury, to 100, death) for children reporting to the emergency center at hospitals and information on which superhero costumes they were wearing (Spiderman, Superman, Batman).

Spiderman Superman Batman
55 68 26
31 32 47
58 85 30
20 69 35
47 58 53
37 52 43

Compute the following descriptive statistics for each group. (30 points total)
a. Mean
b. Sample size (n) for each group
c. Standard Deviation
d. Square root of n
e. Standard error of the mean (SEM)

Answers

Answer:

[tex]Mean = 47[/tex]

[tex]n = 6[/tex]

[tex]s= 16.56[/tex]

[tex]\sqrt n = 2.45[/tex]

[tex]SEM = 11.55[/tex]

Step-by-step explanation:

Given: The above data

Solving (a): Mean of each group

Mean is calculated as:

[tex]Mean = \frac{\sum x}{N}[/tex]

[tex]Mean = \frac{55 + 31 + 58 + 20 + 47 + 37+68 + 32 + 85 + 69 +58 + 52+26 + 47 + 30 +35 + 53 + 43}{18}[/tex]

[tex]Mean = \frac{846}{18}[/tex]

[tex]Mean = 47[/tex]

Solving (b): The sample size of each group

This is the number of rows in each group.

Hence:

[tex]n = 6[/tex]

Solving (c): Standard deviation (s)

This is calculated as:

[tex]s = \sqrt{\frac{\sum (x - \bar x)^2}{N}}[/tex]

So, we have:

[tex]s= \sqrt{\frac{(55 - 47)^2 + (31 - 47)^2 +......... + (43 - 47)^2}{18}}[/tex]

[tex]s= \sqrt{\frac{4936}{18}}[/tex]

[tex]s= \sqrt{274.22}[/tex]

[tex]s= 16.56[/tex]

Solving (d): Square root of n

[tex]\sqrt n = \sqrt 6[/tex]

[tex]\sqrt n = 2.45[/tex]

Solving (e): SEM

This is calculated as:

[tex]SEM = \frac{s}{\sqrt N}[/tex]

[tex]SEM = \frac{47}{\sqrt{16.56}}[/tex]

[tex]SEM = \frac{47}{4.07}[/tex]

[tex]SEM = 11.55[/tex]

Help I’m doing 8th grade work

Answers

Answer:

I think B by I'm not sure

Step-by-step explanation:

I'm not good with this subject

Is x=3, y=2 a solution to the system of equations shown? Justify your answer.
y = 2x - 4
3x + 2y = 8

Answers

Y=2(3)-4=2
3(3)+2(2)=8=12

Answer:

It is not a solution.

Step-by-step explanation:

y = 2x - 4

2 = 2(3) - 4

2 = 6 - 4

2 = 2

The point is a solution to the first equation.

3x + 2y = 8

3(3) + 2(2) = 8

9 + 4 = 8

11 ≠ 8

The point is only a solution for one equation. It is not a solution to the system.

Hope this helps.

a soccer team lost 30% of their games. If they played 20 games, how many did they win

Answers

Answer:

Step-by-step explanation:

100% - 30%= 70% (the times they've won)

0.7x20=14

6 ft = ____ yd

6 ft = 6 x 1 ft

= 6 x ____ yd

= ____ yd

Answers

Answer:

6 ft = 2 yd

6 ft = 6 x 1 ft

= 6 x 2 yd

= 12 yd

What is the slope and y-intercept of the function
f(x) = - 7 + 3x
A. m= 1/3 b= 7
B. m= -3 b= -7
C. m=3 b =-7
D. m= -1/3 b= 7 7

Answers

Answer: the answer is C. M= 3 and B= -7

the slope is always with the (x) and the b is by itself

which Is NOT a linear function?

Answers

I think its Y = x+ 3

In a right triangle, the hypotenuse has endpoints P(-3, 2) and Q(1, -3).

Answers

Answer:

the remaining points either be (-3,-3) or (1,2)

Calculate the length of the unknown side of this right-angled triangle.
9 cm
8 cm

Answers

Answer:

12.04

Step-by-step explanation:

Formula:

a² + b² = c²

8² + 9² = c²

64 + 81 = c²

145 = c²

c = 12.04

1. Two walls of a room or being painted each measure 16 6/2' how many square feet will be painted

2. A rectangular canvas covers 225 inches on a wall if the canvas has a height of 18 inches then what is the base

Answers

Answer:

3.167 ft²

12.5 inches

Step-by-step explanation:

1.)

Measure of each wall : 16 6/2 '

Number of walls = 2

Total area to be painted :

16 6/2' * 2 = (16 + 3) * 2 = 19 * 2 = 38 inches

1 feet = 12 inches

x = 38 inches

12x = 38

x = 38 / 12 = 3.167 ft²

2.)

Area of rectangular canvas = 225

Height = 18

Base, b =?

Area of rectangle = height * base

225 = 18 * b

225 / 18 = 18b / 18

12.5 = b

Base = 12.5 inches

Write the equation of the line in fully simplified slope intercept form

Answers

Answer: right of the picture

Step-by-step explanation:

Elis, Raine and Avery buy a boat for $33 000.
Elise pays $12 000, Raine pays $6000 and Avery pays the rest.
Six years later they sell the boat for $25 300.
They share the money in the same ration that they bought the boat.
How much money does Avery lose on the sale of the boat?

Answers

Amount Avery paid: 32,000-12,000-6,000 = 15,000

Divide portion she paid by total cost:

15,000/33,000

Simplify to 15/33

Multiply the amount the boat was sold for by her portion:

25,300 x 15/33 = 11,500

Subtract the amount she got from the amount she paid:

15,000 - 11,500 = 3,500

She lost $3,500

Answer:

yes

Step-by-step explanation:

yes!

Chapman wants to buy a pair of AirPods however he currently has only 20 he then decides to begin saving his monthly allowance until he has enough for his purchase. After two months, he has saved a total of $66, including his initial $20. Select the linear equation that models S, The total amount of money he will have saved, X months after he begins saving his allowance

Answers

Answer:

Step-by-step explanation:

i think its c but i cant be to sure im only in the 7th grade :) i hope its right

Find the first, fourth, and tenth terms of the arithmetic sequence described by the given rule.

A(n) = 1 + (n – 1)(–5.7)

Answers

Answer is in the photo. I can only upload it to a file hosting service. link below!

tinyurl.com/wpazsebu

1) -4.7
4) -1.7
10) 5.7
I’m sorry if I’m wrong

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