3x+21 6x-60 write an equation to solve for x you're only writing the equation for this problem. see what i mean and yes 27 is right for the next ty so much​

Answer:

Step-by-step explanation:

Using the normal distribution, it is found that 62.46% of students would be expected to score between 350 and 550.

In a normal distribution with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the z-score of a measure X is given by:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

In this problem, the mean and the standard deviation are respectively, given by: [tex]\mu = 425, \sigma = 110[/tex]

The proportion of students that would be expected to score between 350 and 550 is the p-value of Z when X = 550 subtracted by the p-value of Z when X = 350, hence:

X = 550:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

[tex]Z = \frac{550 - 425}{110}[/tex]

[tex]Z = 1.14[/tex]

[tex]Z = 1.14[/tex] has a p-value of 0.8729.

X = 350:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

[tex]Z = \frac{350 - 425}{110}[/tex]

[tex]Z = -0.68[/tex]

[tex]Z = -0.68[/tex] has a p-value of 0.2483.

0.8729 - 0.2483 = 0.6246

62.46% of students would be expected to score between 350 and 550.

More can be learned about the normal distribution at https://brainly.com/question/24663213

Answer: 14 dollar discount

Step-by-step explanation:

Answer:

1 error / about 8 minutes and 30 seconds

Step-by-step explanation:

1/8.5                    Divide the fraction by 7.

By dividing both numbers of the fraction, you are finding how many errors are in the number of minutes you make them.

Exact answer: 1/8.571428 repeated

Rounded answer: 1/8.56

Answer:

The first one is : B. 12

The second one is: B. 4

Step-by-step explanation:

1 Explained:

12 * 3 = 36

36 - 24 = 12

Therefore if he had taken 3 times as many he would have had 36. And 36 is 24 more than 12.

2 Explained:

blue + green + yellow = 240

120 + 40= 160

240 - 160= 80

Yellow= 80

120/20= 6

40/20= 2

80/20= 4

6 blue

2 green

4 yellow

12 in total.

Answer: X = 15  

Explanation:

Well, If 12 equals X minus 3 then we first must flip the signs.

which is adding. So we take 12 and add 3 which would get us 15.

Double check  :  15 (X) - 3 = 12

Answer:

10 slices of cheese at 2.48

Step-by-step explanation:

each slice is about 0.25

Answer:

A

Step-by-step explanation:

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[tex][Hello,BrainlyUser!\; I'm\;Lenvy][/tex]

[tex]Your\;Answer\;Is\;Below[/tex]

Answer:

42 feet

Step-by-step explanation:

First let know what is

Yards to Feet

Note that;

1 Yard ⇒ 3 Feet

Thus, Formula: Multiply the length value by 3

Given:

Lena bought 14 yards of ribbon. How many feet of ribbon did she buy?

Therefore, 14 * 3 = 42

Hence, Answer is Lena brough 42 feet of ribbon.

~[CloudBreeze]~

Answer:

42 feet

Step-by-step explanation:

Important Info:

Lena bought 14 yards of ribbon. How many feet of ribbon did she buy?

Notice it say how many feet..

Therefore, Let's first know what yards to feet..

1 Yard → 3 feet

Since we know that We can Solve now:

To Find how many feet of ribbon she buy let's multiply;

14 x 3  = 42

or

14 + 14 + 14 = 42

Hence, Knowing that Lena brought 42 ribbon in feet.

[RevyBreeze]

Answer:

15.4z−12

Step-by-step explanation:

Distribute:

7.4z+(−5)(−1.6z)+(−5)(2.4)

7.4z+8z+−12

Combine Like Terms:

7.4z+8z+−12

(7.4z+8z)+(−12)

15.4z+−12

Answer:

12*(x-1)

Step by Step Solution

Reformatting the input :

Changes made to your input should not affect the solution:

(1): "2.4" was replaced by "(24/10)". 2 more similar replacement(s)

STEP

1

:

Simplify 12/5

Equation at the end of step

1

:

4x-(5•((0-(16/10•x))+12/5))

STEP

2

:

Simplify 8/5

Equation at the end of step

2

:

4x - (5 • ((0 - (8/5 • x)) + 12/5))

STEP

3

:

Adding fractions which have a common denominator :

3.1 Adding fractions which have a common denominator

Combine the numerators together, put the sum or difference over the common denominator then reduce to lowest terms if possible:

-8x + 12 /5 = 12 - 8x/5

Equation at the end of step

3

:

4x - (5 • (12 - 8x)/5)

STEP

4

:

STEP

5

:

Pulling out like terms :

5.1 Pull out like factors :

12 - 8x = -4 • (2x - 3)

Equation at the end of step

5

:

4x - -4 • (2x - 3)

STEP

6

:

STEP

7

:

Pulling out like terms :

7.1 Pull out like factors :

12x - 12 = 12 • (x - 1)

Final result :

12 • (x - 1)

The car gets 46 miles per gallon in the city.

Divide total miles driven in th city by miles per gallon to find total number of gallons of gas used:

10,000 miles / 46 miles per gallon = 217.3913 gallons of gas used.

Now multiply gallons used by price per gallon:

217.3913 x $1.75 = $380.43 per year

[tex] \sf \: b - 7400 = {2}^{t} [/tex]

We have to make it as a function of T

So,

[tex] \sf \: b(t) = {2}^{t} + 7400[/tex]

We moved the constant to the right-hand side and changed its sign...

[tex]\red{ \rule{35pt}{2pt}} \orange{ \rule{35pt}{2pt}} \color{yellow}{ \rule{35pt} {2pt}} \green{ \rule{35pt} {2pt}} \blue{ \rule{35pt} {2pt}} \purple{ \rule{35pt} {2pt}}[/tex]

Answer:

65 degrees

Step-by-step explanation:

Since the two straight lines are parallel, this means that Angle 1 and the 65 degrees angle are alternate interior angles; meaning that they're congruent.

So:

Angle 1 = 65 degrees

Hope this helps!

Please let me know if I'm incorrect :)

Answer:

The answer is 65  (degree symbol here)

Step-by-step explanation:

two interior angles on the inside of this shape will always be the same

Answer: upper bound = 89.36 and lower bound = 94.64

Step-by-step explanation:

Confidence interval for mean : [tex]\overline{x}\pm z^*\dfrac{\sigma}{\sqrt{n}}[/tex], where [tex]\overline{x}[/tex] = sample mean , n= sample size , z* = two-tailed critical value, [tex]\sigma[/tex]= population standard deviation

As per given , we have

[tex]\overline{x}[/tex] = 92

n =  55

[tex]\sigma[/tex]= 10

Critical value for 95% confidence interval = 1.96

Required confidence interval :  [tex]92\pm (1.96)\dfrac{10}{\sqrt{55}}[/tex]

[tex]92\pm (1.96)(1.3484)\approx92\pm2.64\\\\= (92-2.64,\ 92+2.64)\\\\=(89.36,\ 94.64)[/tex]

Hence, for 95% confidence interval for the mean IQ of primary school students:

upper bound = 89.36 and lower bound = 94.64

Answer:

Yes she is correct :)

Step-by-step explanation:

There are 100 centimeters in 1 meter so we divide the 100 by 20.

The 20 goes into 100 4 times so yes, she will use 1/4 of the wire for each bracelet :)

Have a great day!!

Please rate and mark brainliest!!

Answer:

$20.93

Step-by-step explanation:

2.99 x 7= 20.93

Answer:

1200 km

Step-by-step explanation:

Just multiply by 20

Using the vertex of the quadratic equation, it is found that the company should assign 5 programmers in order to complete the development as quickly as possible.

A quadratic equation is modeled by:

[tex]y = ax^2 + bx + c[/tex]

The vertex is given by:

[tex](x_v, y_v)[/tex]

In which:

[tex]x_v = -\frac{b}{2a}[/tex]

[tex]y_v = -\frac{b^2 - 4ac}{4a}[/tex]

Considering the coefficient a, we have that:

In this problem, the time needed for x programmers to finish the project is given by:

T(x) = 100 - 30x + 3x².

Which means that the coefficients are a = 3, b = -30, c = 100. The number of programmers which will minimize the time is given by:

[tex]x_v = -\frac{-30}{6} = 5[/tex]

More can be learned about the vertex of a quadratic equation at https://brainly.com/question/24737967

Answer:

Slope = -1/2.

Step-by-step explanation:

2 points on the line are (10, 0) which is where the line passes through the x-axis and (0, 5 ) where it passes through the y-axis.

The slope = (difference in y coordinates) / ( corresponding difference in  x coordinates)

= (5 - 0) / (0 - 10)

= -5/10

= -1/2.

Answer:

16 eggs makes 4 batches 28 eggs makes 7 batches 52 eggs makes 13 batches

Step-by-step explanation:

I'm not sure but I believe that is correct

Answer:

If two angles and the included side of one triangle are congruent to the ... For item numbers 3, 4 and 5 refer to the figure at the right. 3.

34 pages

Step-by-step explanation:

» There are 8 watermelons and 6 apples in the shopping cart. What is the ratio of apples to total fruits? Be sure to write your answer in lowest terms.

— — — — — — — — — —

Based on the problem, there are 8 watermelons and 6 apples in the shopping cart. So,

Therefore, the ratio of apples to total fruits is 8:14 and its lowest term is 4:7.

_______________∞_______________

Answer:

[tex]\displaystyle \perp\:y = -\frac{4}{7}x + 6\frac{4}{7} \\ \parallel\:y = 1\frac{3}{4}x - 12[/tex]

Step-by-step explanation:

Perpendicular equations have OPPOCITE MULTIPLICATIVE INVERCE RATE OF CHANGES [SLOPES], so 1¾ becomes −⁴⁄₇, and we move forward:

[tex]\displaystyle 2 = -\frac{4}{7}[8] + b \hookrightarrow 2 = -4\frac{4}{7} + b; 6\frac{4}{7} = b \\ \\ \boxed{y = -\frac{4}{7}x + 6\frac{4}{7}}[/tex]

Parallel equations have SIMILAR RATE OF CHANGES [SLOPES], so 1¾ remains as is as we proceed:

[tex]\displaystyle 2 = 1\frac{3}{4}[8] + b \hookrightarrow 2 = 14 + b; -12 = b \\ \\ \boxed{y = 1\frac{3}{4}x - 12}[/tex]

I am joyous to assist you at any time.

d

the a. isn't part sorry

Answer:

100x5

1x9

.1x1

Step-by-step explanation:

Answer:

y = 25x +100

He will collect 275 pounds in 7 weeks

It will take him 12 weeks.

Hope this helps!

Answer:

Two sample test of paired means with unknown variance (standard deviation)

Step-by-step explanation:

Step-by-step explanation:

9000000 could be writen as 9*(10^6)

The membership would be worth the money if the number of DVD's rented is more than 20

A linear equation is in the form:

y = mx + b

Where y,x are variables, m is the rate of change and b is the initial value of y.

Let y represent the cost of renting x DVD

They decided to create a membership for $20 flat fee and then charge $4 per DVD for members. For members:

y = 4x + 20

Non-members could also rent a DVD, but for $5 per DVD

y = 5x

The membership would be worth the money if:

5x > 4x + 20

x > 20

The membership would be worth the money if the number of DVD's rented is more than 20

Find out more on linear function at: https://brainly.com/question/15602982

Answer:

Thirty-seven and twenty-five thousandths