Help please!!!!!!!

The length of a text messaging conversation is normally distributed with a mean of 2 minutes and a standard deviation of .5 minutes. What is the probability that a conversation lasts longer than 3 minutes?,

Answers

Answer 1
This would be a bell curve with a z-score of greater than +2.00, since 3 minutes is exactly two standard deviations greater than the mean of 2.00. Looking at a z-score table for the proportion of the curve that lies in the 1-tailed area greater than 2.00, we find that the value is .0228. This would be the probability that the conversation is over three minutes: 0.0228 or 2.28%.

Related Questions

Can there be a right triangle with side lenghts of 1,2,3

Answers

Nope, it doesn't follow the Pythagorean Theorem.

The admission fee at the county fair is $2 for children and $4 for adults. on a certain day, 2000 people enter the fair and $5000 is collected. using c as the variable to represent the number of children and a as the variable for adults, write a system of equations to determine how many children and how many adults attended. note down this system of equations so that you can use it for the next question.

Answers

a + c = 2000 . . . . . . 2000 people entered the fair
4a +2c = 5000 . . . . $5000 was collected in admission fees

_____
Solving by your favorite method reveals
.. a = 500
.. c = 1500

List the angles of triangle DEF in order from smallest to largest measure if DE = 7, EF = 9, and DF = 3.


∠D, ∠E, ∠F


∠E, ∠F, ∠D


∠F, ∠E, ∠D


∠D, ∠F, ∠E

Answers

The angles in order from smallest to largest would be ∠E, ∠F, ∠D.

∠D is opposite side EF.  ∠E is opposite side DF.  ∠F is opposite side DE.  The sides that are the smallest correspond with the smallest angles, and the sides that are the largest correspond with the largest angles.
Answer: The order from smallest to largest is <E, <F, <D

First, you should draw a picture of triangle DEF and label all of the sides. Then, you will have an idea of what the triangle looks like and the relative size of the angles.

You can also look at the side opposite of the angle. The larger the opposite side, the larger the angle.

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Given the right triangle PQR below, which of the following is equal to y/x?

A. cos P

B. cos Q

C. tan P

D. tan Q

Answers

C. tanP =QR/QP=y/x
p/s : follow me and I will help you more about maths

The value of tan P = y /x , Option C is the right answer.

What is a Right Angled Triangle ?

A triangle in which one of the sides is 90 degree is called a Right angled Triangle.

A right angled Triangle is given in the question

The sides of the triangle is x and y

The trigonometric ratios are given and it has to be determined that x/ y represents which one of the given option.

The value of tan x =  Perpendicular / Base

y/ x =  Perpendicular / Base for angle P

Therefore , The value of tan P = y /x , Option C is the right answer.

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Which expression is equivalent to (x - 6) (2x2 - 3x + 4)? 2x2 - 2x - 2 2x2 - 2x + 4 2x3 - 3x2 + 4x - 6 2x3 - 15x2 + 22x - 24

Answers

(x -6)(2x² -3x +4) = 2x³ -15x² +22x -24

The 4th selection is appropriate.

_____
You only need to look at the constant term of the product (-6)(+4) = -24 to choose the correct answer.

An instructional video is 4.2 minutes long. How long is the video in seconds? How long is it in hours?

Answers

384 seconds, 0.106 hours
252 seconds, and the hours hang on just a sec! 

The number of visitors to a park is expected to follow the function v(x) = 7(x − 1), where x is the number of days since opening. On the first day, there will be a ceremony with 39 people in attendance. What is the function that shows total visitors, including the ceremony?


c(x) = 7(x − 1) − 39
c(x) = 39x − 7
c(x) = 39 − 7(x − 1)
c(x) = 39 + 7(x − 1)

Answers

c(x) = 39 + 7(x - 1)

The answer is D. c(x) = 39 + 7(x - 1)

Lyle deposited a check for $75.26. He’ll use the check register to record his transaction. What will be his new balance?

Answers

Answer

$896.44

Explanation

Remember that to get the current balance, you subtract all the debits from balance and add all the deposits to it.

We know from our table that the first transaction is medical bill, which is debit, so we are going to subtract the medical bill from the balance to find the  balance at that point in time.

Balance = $862.74 - $41.56 = $821.18

We also know that the second transaction is a check deposit for $75.26, so to find the current balance, we just need to add $75.26 to our previous balance.

Current balance = $821.18 + $75.26 = $896.44

Answer:

its B

Step-by-step explanation:

Please help I don’t understand it

Answers

c= number of crickets
g= number of grasshoppers= twice number of crickets= 2c
T= total number of both= 561

If you add the number of crickets and the number if grasshoppers, you'll get a total of 561.

c + g= T
c + g= 561

Now we also know that grasshoppers are 2c (twice the crickets). Substitute 2c for g in the equation to solve for c.

c + g= 561
c + 2c= 561
combine like terms
3c= 561
divide both sides by 3
c= 187 crickets

Substitute number of crickets back in equation to find g.

c + g= 561
187 + g= 561
subtract 187 from both sides
g= 374 grasshoppers

CHECK:
Since grasshoppers are twice the number of crickets, then multiplying the number of crickets by two should equal the number of grasshoppers.
187 * 2= 374
374= 374

ANSWER: 187 crickets and 374 grasshoppers

Hope this helps! :)

Triangle ABC has vertices at A(4, 7) , B(13, 7) , and C(9, 11) .

Triangle FGH has vertices at F(1, 1) , G(10, 1) , and H(6, 5) .

Which sequence of transformations shows that triangle ABC and triangle FGH are congruent?

Select each correct answer.




A Translate ​ triangle FGH ​ down 6 units, and then translate ​ triangle FGH ​ left 3 units. ​

B Translate ​ triangle FGH ​ up 6 units, and then translate ​ triangle FGH ​ right 3 units. ​

C Translate ​ triangle ABC ​ up 6 units, and then translate ​ triangle ABC ​ right 3 units.

D Translate ​ triangle ABC ​ down 6 units, and then translate ​ triangle ABC left 3 units.
The coordinates of the vertices of triangle XYZ are given in the table.

X Y Z
(0, −6) (−10, 4) (3, −1)


Triangle XYZ is reflected across the y-axis.

What are the vertices of triangle X′Y′Z′ ?



Enter your answers in the boxes.



X′ : (
, ​
​)

Y′ : (
, ​
​)

Z′ : (
, ​
​)



The coordinates of the vertices of triangle XYZ are given in the table.

X Y Z
(0, −6) (−10, 4) (3, −1)


Triangle XYZ is reflected across the y-axis.

What are the vertices of triangle X′Y′Z′ ?



Enter your answers in the boxes.



X′ : (
, ​
​)

Y′ : (
, ​
​)

Z′ : (
, ​
​) The coordinates of the vertices of triangle XYZ are given in the table.

X Y Z
(0, −6) (−10, 4) (3, −1)


Triangle XYZ is reflected across the y-axis.

What are the vertices of triangle X′Y′Z′ ?



Enter your answers in the boxes.



X′ : (
, ​
​)

Y′ : (
, ​
​)

Z′ : (
, ​
​)



































































Answers

1) F - A = (1, 1) -(4, 7) = (-3, -6). Triangle FGH has been translated left 3 and down 6, corresponding to selection D.

2) Reflecting (x, y) across the y-axis changes it to (-x, y).
.. X' = (0, -6) . . . . . the point maps to itself. It is on the line of reflection.
.. Y' = (10, 4)
.. Z' = (-3, -1)

What is measure of angle P?

Enter your answer as a decimal in the box. Round only your final answer to the nearest hundredth.

Answers

Sin P = opp/hyp
sin P = 15/17
P = sin⁻¹(15/17)
P = 61.93° (nearest hundredth)

Answer:

The measure of angle P is 61.93°

Step-by-step explanation:

We are given a right triangle with measures 8 cm, 15 cm and 17 cm.

For angle P, we see that,

Perpendicular = 15 cm

Hypotenuse = 17 cm

Using the trigonometric forms of the angles, we have,

[tex]\sin P=\frac{Perpendicular}{Hypotenuse}[/tex]

i.e. [tex]\sin P=\frac{15}{17}[/tex]

i.e. [tex]\sin P=0.88235[/tex]

i.e. [tex]P=\arcsin 0.88235[/tex]

i.e. P = 61.93°

Hence, the measure of angle P is 61.93°.

4(5y − 8 − 2) = 185 − 15 solve that pls

Answers

plug in 10.5 into the equation you should get 170 witch is 185-15 so y= 10.5

A student takes a true-false test that has 12 questions and guesses randomly at each answer. let x be the number of questions answered correctly. find p(x=5)
a. 0.1934
b. 0.2256
c. 0.1208
d. 0.0002

Answers

The correct answer is a) 0.1934.

The binomial distribution is
[tex](_k^n)p^k(1-p)^{n-k}[/tex], where n is the number of trials (questions), k is the number of successes (correct answers), and p is the probability of a success (0.5 on true-false questions).  Using our information we have:

[tex](_5^{12})(0.5)^5(1-0.5)^{12-5} \\ \\=(_5^{12})(0.5)^5(0.5)^7 \\ \\=\frac{12!}{5!7!}(0.5)^5(0.5)^7 \\ \\=792(0.5)^5(0.5)^7 \\=0.1934[/tex]

Wally buys nine books that coast $19.50 apiece. How much does Wally spend?

Answers

Hi there!

To solve this problem, we need to multiply the cost of each book by the amount of books Wally bought.

$19.50 × 9 = $175.50

So, the total amount payed was $175.50.

Hope this helps!
you have to multiply  19.50 x 9 = 175.5

The Great Pyramids of Giza, Egypt are dedicated the following pharaohs EXCEPT ___________.
a. Khafre
b. Tutankhamen
c. Khufu
d. Menkaure,

Answers

The Great Pyramids of Giza are dedicated to Khafre, Khufu, and Menkaure. Tutankhamen did not have a pyramid dedicated to him and the tomb he was buried in was even smaller than was typical by that point in Egyptian history for someone of his social status.
Final answer:

The Great Pyramids of Giza in Egypt are dedicated to Khafre, Khufu, and Menkaure, but not Tutankhamen.

Explanation:

The Great Pyramids of Giza in Egypt are dedicated to three pharaohs - Khafre, Khufu, and Menkaure. The pharaoh that is not associated with one of the Great Pyramids is Tutankhamen. Tutankhamen, also known as King Tut, ruled during the 18th dynasty of the New Kingdom but was not part of the Fourth Dynasty that built the pyramids at Giza.

HOW TO DO THIS? Find value of x

Answers

the value of x can be found using the tangent ratio.

tan 25 = x/5
5 (tan 25) = x
2.33 = x

Hope this helps :)
tan (25) = x / 5
x = 5 * tan (25)
x = 5 * .46631
x = 2.33155


The 9 officers of the Student Council are going on a trip to an amusement park. Each student must pay an entrance fee plus $5 for meals. The total cost of the trip is $225. Solve the equation 9(e + 5) = 225 to find the cost e of the entrance fee for each student. Question options: A) $25 B)$14 C) $45 D) $20

Answers

D) $20 because if you plug it in to the equation it equals $225

Answer:

The Answer to this question is $20

Step-by-step explanation:

9 x 5 = $45

225 - 45 =180

180/9 =20

Subtract the linear expression: (8x + 5) - (2x- 4)

Answers

Remove parenthesis: 8x+5-2x-4. Combine like terms: 8x-2x+5-4.
Solve: 6x+1 if I’m correct.

solve the system by either elimination or substitution
3x-5y=21
2x+y=1
A.2,-3
B.2,3
C.-2,-1
D.-2,1
My guess is c

Answers

The correct answer is A: x=2 and y=-3. Either method would work, but for example, let's use elimination. If you multiply the second equation by 5, you get: 10x +5y = 5. When you add both equations, you can then cross out both y terms. You are left with one equation that reads: 13x=26. Solving for x gives you 2. You can substitute 2 in for x in either equation and you will receive -3 for your y value.

What number is 32% of 75?



Which of the following equations could be used to solve the problem?


n = 0.32(75)
0.32n = 75
n = 75 ÷ 0.32

This is just a reassurance question It's
n = 75 ÷ 0.32 Right?,

Answers

32% of 75 is 24


Explanation:

A percentage is a value out of 100

32% of 75

32/100*75/1


32/100*75/1   Cancel and Simplify.



8/1*3/1

Answer = 24


2: The following equation used to solved the problem is:

(A):  N = 0.32(75)


Hope this helps.

24 is 32% of 75. The answer can be found by setting up a proportion: n/75 is set equal to 32/100, where x represents 32% of 75. By using cross multiplying and solving for the variable "n" we can determine that n = 24. Therefore, the equation n = 0.32(75) could be used to determine the correct answer. The formula n = 75 ÷ 0.32 is incorrect.

Please show work! Thank you

Answers

Answers:
Factored Form is (x+4)(x+2)
Expanded Form is x^2+6x+8

----------------------------------------------------------
----------------------------------------------------------

Explanation:

The factored form is simply a matter of reading off the values from the given image. There isn't much work to show here.
Along the left side we have x and 4 so x+4 is one of the factors. Along the bottom we have x and 2, so x+2 is another factor
The two factors are (x+4) and (x+2) so that's why the factored form is (x+4)(x+2)

-------------------------------

Let's expand out the factored form

The overall rectangle is broken up into four parts. I'll label the four smaller rectangles as...

Rectangle A in the upper left corner (this rectangle is x by x)
Rectangle B in the upper right corner (this rectangle is 2 by x)
Rectangle C in the lower left corner (this rectangle is x by 4)
Rectangle D in the lower right corner (this rectangle is 2 by 4)

The idea is that adding the areas of rectangles A through D leads us to the overall area for this largest rectangle.

Area of Rectangle A = (length)*(width) = x*x = x^2
Area of Rectangle B = (length)*(width) = 2*x = 2x
Area of Rectangle C = (length)*(width) = x*4 = 4x
Area of Rectangle D = (length)*(width) = 2*4 = 8

Notice we have the like terms 2x and 4x (areas of rectangle C and D respectively). They combine to 2x+4x = 6x

So after adding all the individual areas and combining like terms, we arrive at the fully expanded form of x^2+6x+8

Samantha’s younger brother just turned 3 years old. Fred’s brother is now 30 months old. Who brother is older? Explain

Answers

1. You have that:
 
 - Samantha’s younger brother  turned 3 years old.
 - Fred’s brother is 30 months old.
 
 2. one (1) year has twelve (12) months. Keeping this on mind, you have to follow the proccedure below:
 
 3 yearsx12 months=36 months
  
 3. As you can see, Samantha’s younger brother just turned 36 months old  and Fred’s brother is 30 months old. Therefore, you can conclude that Samantha’s younger brother is older than Fred’s brother.


Expand the logarithm. log4 (3xyz​)^2

Answers

2(log4(3)+log4(x)+log4(y)+log4(z))

Answer:

Answer is (2log2 + 2log3 + 2logx + 2logy + 2logz)

Step-by-step explanation:

log4(3xyz)²

= log4 + log(3xyz)²

= log4 + 2log(3xyz)

= log(2)² + 2[log3 + logx + logy + logz]

= 2log2 + 2log3 + 2logx + 2logy + 2logz


Kareem wants to wallpaper the back wall of his bedroom. The wall is in the shape of a rectangle. Its length is
13 feet and its width is 12
feet. The wallpaper costs $8
for each square foot. How much will wallpaper cost for the wall?

Answers

The first step in solving this problem is to compute for the area of the rectangular wall. The formula in computing the area of a rectangle is:

A = LW

Substituting the given measurements in the problem to the formula:

A = 13 (12)

A = 156

Therefore, the area of the wall is 156 square feet. To compute the wallpaper cost of the wall, you have to multiply the cost per square foot to the total area.

$8 per square foot x 156 square feet = $1,248

Therefore, the wallpaper cost for the wall is $1,248

WILL GIVE BRAINLIEST FOR CORRECT ANSWER

8. Find the value of x. Round the length to the nearest tenth. The diagram is not drawn to scale. EXPLAIN HOW YOU GOT THE ANSWER OR YOU DONT GET THE BRAINLIEST

Answers

The value of x in the triangle using the principle of Pythagoras is 2879.4 meters

Given the right angle triangle :

The angle of elevation = 10°Opposite side = 500 mx = hypotenus

Recall :

SOHCAHTOA

Using the relation :

Sin θ = opposite / hypotenus

Sin 10° = 500 / x

Cross multiply :

x(sin 10°) = 500

0.1736481x = 500

x = 500 / 0.1736481

x = 2879.39 meters

Therefore, the value of x in the triangle is 2879.4 meters.

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Answer: 2879.39 meters

Step-by-step explanation:

AD←→ is tangent to circle M at point D. The measure of ∠DMQ is 50º.

What is the measure of ∠DQM?

Answers

Answer:

Hello! I just completed the quiz :))

Step-by-step explanation:

This is for more confirmation (´。• ᵕ •。`) ♡ glad I could help!

Tangent is a straight line that touches the circle at any point on the curve.  The measure of ∠DQM in ΔDQM is 40º.

What is a tangent?

A tangent is a straight line that touches the circle at any point on the curve. And the angle made by the tangent with radius is always 90°.

We know that line AD is the tangent to circle M, and line MD is the radius of the circle, therefore, the measure of ∠ADM is 90°.

Now, In ΔDQM, the measure of ∠DMQ is 50º, while the measure of ∠MDQ is 90º. therefore, the sum of all the angles of the ΔDQM can be written as,

[tex]\angle DQM + \angle MDQ + \angle DMQ = 180^o\\\\\angle DQM + 90^o + 50^o = 180^o\\\\\angle DQM = 180^o -90^o -50^o\\\\\angle DQM = 40^o[/tex]

Hence,  the measure of ∠DQM is 40º.

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What is the area of this figure?



Enter your answer in the box.


units²

Answers

Area of top triangle = 1/2(7)(2) = 7
Area of rectangle = 4 x 7 = 28
Area of bottom triangle = 1/2(7)(2) = 7

Area of figure = 7+ 28 + 7 = 42

answer
42 units²

Answer:

The answer to this is 42 units²

Step-by-step explanation:

IF YOU HELP ME ILL WILL GIVE YOU BRAINLIST AND 50 PONITS HELP ME PLZZZZZ



Which statement or statements are TRUE?

I. The data distribution is skewed
II. The interquartile range is 6
III. The median is 10
A) I only
B) II only
C) I and II only
D) II and III only

Answers

I think the answer is A because the data is skewed to the right 
The median (middle) isn't 10, it's 8 
The interquartile range (IQR) is 7 not 6 because you have to subtract the first and third quartile 13 - 6 = 7 not 6

Hope this helps! ;)

I think the answer is A

HELP PLEASE!!?!
5. The half-life of a certain radioactive material is 78 hours. An initial amount of the material has a mass of 790 kg. Write an exponential function that models the decay of this material. Find how much radioactive material remains after 18 hours. Round your answer to the nearest thousandth.,

Answers

The half life is 78 hours and the amount after 78 hours is 395 kg hence time constant is 395 = 790 * e^(p*78) By taking 790 common and natural log on both side ln (395 / 790) = (p*78) -0.6931 = 78*p -0.0088 = p (or -0.88%) Material left after 18 hours is A(18) = 790 * e^(-0.0088*18) A = 673.301 kg

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What is the value of x?

Answers

x/10 = 10/4x
4x^2  = 100
  x^2 = 25
     x = 5

answer
5 units
Final answer:

The value of x can signify diverse number based on the context it is applied in. For instance, it can be a certain range of values, part of a chemical equation, or the result of a mathematical equation. Therefore, the value of x is determined by the given conditions.

Explanation:

The value of x can be discovered through various mathematical processes depending on the context. In the examples given, x was used to denote different values across multiple scenarios.

One situation presented x as a value that ranged from 1.5 to 4.5, indicated by 1.5 ≤ x ≤ 4.5. In another instance, x was determined by the concentration of hydroxide ions in a chemical equation, which resulted in x = 4.0 × 10-³ M. Furthermore, x was also inferred from a quadratic equation where it implied the hydronium concentration.

In summary, the value of x varies based on the mathematical or scientific context it is applied to, and its value must be determined through specified conditions or equations.

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