if we would like to use smartphone addiction and smartphone usage, to predict how often an individual uses a smartphone (frequency: on average, how many hours do you use your phone every day), what should we do? perform an appropriate test and write a summary.

Answer:

A is the answer

Step-by-step explanation:

the center of the circle is (-2,-1) so you're going to reverse their signs and insert that value in for x and y. the radius is 5, but the equation of a circle is

\(x ^{2} + {y}^{2} = {r}^{2} \)

so you're going to square the radius, this making it 25.

The 99% confidence interval for the mean price of all transactions of a used car company selling second-hand cars, based on a sample of 30 transactions with a population standard deviation of 180 dollars, is $2437.24 to $2562.76. The correct interpretations of the confidence interval are If we repeat the study many times, approximately 99% of the calculated confidence intervals will contain the mean price of all transactions and the 99% confident that the mean price for this sample of 30 transactions lies in the interval. so, the correct answers are B and E.

Using the formula for a confidence interval with known population standard deviation, we have

Margin of error = z*(sigma/sqrt(n)) = 2.576*(180/sqrt(30)) = 62.76

Confidence interval = (sample mean - margin of error, sample mean + margin of error) = (2500 - 62.76, 2500 + 62.76) = (2437.24, 2562.76)

Therefore, the 99% confidence interval for the mean price of all transactions is (2437.24, 2562.76) dollars.

The correct interpretations of answer in above part are options B and E

We can be 99% confident that the mean price for this sample of 30 transactions lies in the interval. If we repeat the study many times, approximately 99% of the calculated confidence intervals will contain the mean price of all transactions.

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--The given question is incomplete, the complete question is given

"  An online used car company sells second-hand cars. For 30 randomly selected transactions, the mean price is 2500 dollars. Part a) Assuming a population standard deviation transaction prices of 180 dollars, obtain a 99% confidence interval for the mean price of all transactions. Please carry at least three decimal places in intermediate steps. Give your final answer to the nearest two decimal places. Confidence interval: ). Part b) Which of the following is a correct interpretation for your answer in part (a)? Select ALL the correct answers, there inay be more than one. A. There is a 99% chance that the mean price of all transactions lies in the interval. B. We can be 99% confident that the mean price for this sample of 30 transactions lies in the interval. e. 99% of their mean sales price lies inside this interval. D. We can be 99% confident that all of the cars they sell have a price inside this interval. E. If we repeat the study many times, approximately 99% of the calculated confidence intervals will contain the mean price of all transactions. F. 99% of the cars they sell have a price that lies inside this interval. O G. None of the above.

To solve the given problem, we can use the method of synthetic division, which is the shorthand method of polynomial long division. We need to find the quotient, given that the remainder will be 0 by synthetic division, for the polynomial: $x^4 - 53x^3 + 37x^2 - 39x + 20$. Below is the synthetic division table:$$\begin{array}{c|ccccc} & 1 & -53 & 37 & -39 & 20 \\ 5 & & 5 & -240 & 988 & -2455 \\ & & & -975 & 5263 & -12116 \\ & & & & 5605 & -21045 \\ & & & & & 0 \\ \end{array}$$Therefore, the quotient is given by:$$\frac{x^4 - 53x^3 + 37x^2 - 39x + 20}{x-5} = x^3 - 48x^2 + 236x - 1189$$Hence, the quotient for $x^4 - 53x^3 + 37x^2 - 39x + 20$ by synthetic division, given that the remainder is 0, is $x^3 - 48x^2 + 236x - 1189$.

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The cost price that was used to get the book is: R.S 172

The parameters given are:

Marked Price: M.P = RS. 250

Discount allowed = 10%

The formula to find the selling price here will be:

S.P = M.P * (100 - Discount)/100

Thus:

S.P = 250 * (100 - 14)/100

S.P = 250 * 0.86

S.P = R.S 215

Since the profit is 25%, then we have:

Cost Price = (S.P * 100)/(100 + Gain%)

Cost price = (215 * 100)/(100 + 25)

Cost Price = 21500/125

Cost price = R.S 172

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Answer:

lol W = 50 im pretty sure-

bakugou is out of my league so go ahead uraraka :')

Then the approximate distance between the points is 4.47 units.

We have the points G(1, 4) and H(3, 0), to get the distance between them we use the distance formula, we will get:

\(D = \sqrt{(1 - 3)^2 + (4 - 0)^2} \\\\D = \sqrt{(-2)^2 + (4)^2}\\\\D = \sqrt{4 + 16} = \sqrt{20}\)

And we know that √20 ≈ 4.47

Then the approximate distance is 4.47 units.

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Answer:

The lateral area of a cone is 141.4 square centimeters

Step-by-step explanation:

Mathematically, we have the formula for the lateral area of a cone as;

A = pi * r * l

where r is the radius of the cone and l

is the slant height of the cone

Mathematically, the radius is simply half the measure of the diameter

we have that as 10/2 = 5 cm

So substituting these values;

A = 22/7 * 9 * 5

A = 141.4 square centimeters

1. The graph that has a slope of -2/3 and a y-intercept of 2 is given as follows:

Graph of a line passing through the points (0,2) and (3,0).

2. The graph that represents the equation y = 0.5x - 1 is given as follows:

Graph of a line passing through the points (-2,-2) and (0,-1).

3. The graph that represents the relation is given as follows:

Graph with the x axis labeled number of days and the y axis labeled total amount of sunglasses and a line going from the point (0,58) and (1, 56).

The slope-intercept definition of a linear function is given as follows:

y = mx + b.

In which:

For the graph that has a slope of -2/3 and a y-intercept of 2, we have that:

The y-intercept and the slope of the equation y = 0.5x - 1 is given as follows:

-1, meaning that the function passes through the point (0,-1).

When x = -2, the value of the function is given as follows:

y = 0.5(-2) - 1

y = -1 - 1

y = -2.

Hence the other point is (-2,-2).

For the relation in item 3, we have that when x increases by 3, y decays by 6, hence the slope m is given as follows:

m = -6/3

m = -2.

Hence:

y = -2x + b.

When x = 2, y = 54, hence the intercept b is given as follows:

54 = -2(2) + b

b = 58.

Hence the function is:

y = -2x + 58.

The points are:

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Answer:

ED

Step-by-step explanation:

Since,

Δ ABC ≅ Δ DEF

Side AB is congruent to side DE

Or

BA is congruent to ED.

Answer:

C.  \(f(x)=(x+1)^2-4\)

Step-by-step explanation:

A. the graph is a straight line with slope 1.  It goes up/down infinitely far so the range is all real numbers.  Not A!

B. The graph is a straight line with slope -4, so, like the function in A, the range is all real numbers.  Not B!

D. The graph is an absolute value function  y = |x|, reflected over the x-axis, shifted right 3 units, then shifted down 4 units.  So the graph starts witha "vee" shape opening up, becomes a vee opening down, then ultimately gets shifted down 4 units.  The range is all real numbers less than or equal to -4.

See the attached graphs.  image2 is the function in answer choice D.

Answer: 240 mins

Step-by-step explanation:

Answer:1) 32.  2).  3) 21.  4) 4

Step-by-step explanation: 1) 4*8=32m, 2) I don't know, 3) 6*7=42 for the area of a square but since a triangle half it so its 21, An the last is by 4 for example 4*10=40 but if doubled its 20*8 and that equals 160. and 160/40=4

Answer:

i find you !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Step-by-step explanation:

Answer:

El primer patio, con cada mayólica tipo A, tiene mayor área.

La diferencia entre las áreas de los patios es 3.4425 m²

Step-by-step explanation:

Sabes que las medidas de cada mayólica tipo A son 45 cm x 45 cm y Víctor coloca 9 mayólicas del tipo A en cada lado del primer patio. Entonces para calcular las medidas de cada lado del patio si colocas las mayólicas debes multiplicar la medida de una por la cantidad de Víctor coloca:

9*45 cm= 405 cm

Siendo la mayólica un cuadrado, donde todos los lados son iguales y que en este caso mide 45 cm, entonces el otro lado del patio también medirá 405 cm.

Siendo el patio un cuadrado, cuya área es el producto entre dos lados, su superficie es:

405 cm* 405 cm= 164,025 cm²

Siendo 1 cm² igual a 0.0001 m², entonces el área tiene un valor de 16.4025 m².

Sabes que las medidas de cada mayólica tipo B son 30 cm x 30 cm y Víctor coloca 12 mayólicas del tipo B en cada lado del segundo patio. Entonces para calcular las medidas de cada lado del patio si colocas las mayólicas debes multiplicar la medida de una por la cantidad de Víctor coloca:

12*30 cm= 360 cm

Siendo la mayólica un cuadrado, donde todos los lados son iguales y que en este caso mide 30 cm, entonces el otro lado del patio también medirá 360 cm.

Siendo el patio un cuadrado, cuya área es el producto entre dos lados, su superficie es:

360 cm* 360 cm= 129,600 cm²

Siendo 1 cm² igual a 0.0001 m², entonces el área tiene un valor de 12.9600 m².

Entonces el primer patio, con cada mayólica tipo A, tiene mayor área.

La diferencia es el resultado de la resta o sustracción. En este caso entonces la diferencia entre las áreas de los patios es:

16.4025 m² - 12.9600 m²= 3.4425 m²

La diferencia entre las áreas de los patios es 3.4425 m²

we have the equatiion

4x-5y=20

Convert to slope intercept form

y=mx+b

so

Isolate the variable y

step 1

subtract 4x both sides

4x-5y-4x=4x+20

simplify

-5y=-4x+20

step 2

Divide both sides by -5

so

-5y/-5=(-4x+20)/-5

simplify

In the context of Range Safety and Risk Mitigation, the ability to detect, assess, and respond to potential hazards is essential.

Range safety and risk mitigation involve identifying and minimizing potential hazards associated with range operations, such as the launch or test of rockets, missiles, or unmanned aerial vehicles. To ensure safety, it is critical to have the ability to detect and assess potential hazards, such as debris, vehicle or equipment malfunctions, and human error. Once hazards have been identified and assessed, the next step is to develop and implement appropriate safety measures to mitigate the risk associated with those hazards. These measures may include the use of safety protocols, engineering controls, or administrative procedures to ensure that all personnel and equipment are protected. In summary, the ability to detect, assess, and respond to potential hazards is critical for effective range safety and risk mitigation. By implementing appropriate safety measures and protocols, the risks associated with range operations can be minimized, ensuring the safety of personnel and equipment.

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The correct answer is option B which is we need ∠L ≅ ∠R to prove congruency.

The Side-Angle-Side Congruence Theorem (SAS) defines two triangles to be congruent to each other if the included angle and two sides of one is congruent to the included angle and corresponding two sides of the other triangle.

According to the SAS theorem which means Side Angle Side, The angle which is included between the two sides must be congruent.

Here we are given that

KL = NR

JL = MR

Now in the figure, we can clearly see that the angle included between JL & KL is L & the angle included between NR & MR is R.

So for the triangles to be congruent by SAS, angle L must be congruent to angle R.

∠L=∠R

Therefore the correct answer is option B which is we need ∠L ≅ ∠R to prove congruency.

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Answer:

B  

Step-by-step explanation:

L=R

Answer:

it is 38.74

Step-by-step explanation:

kekdjfjaksodkfjaj

Answer:

131.63

Step-by-step explanation:

Sample method: Use properties of operations. Let x represent the markup.

​

            x98.75=33.3100                             Write the proportion.

            x98.75=0.333                              Divide 33.3 by 100.

98.75 · x98.75=(0.333)∙98.75               Multiplication Property of Equality

                      x=32.88                              Simplify.

​

Add the markup to the wholesale cost.

The selling price is  $98.75+$32.88  or $131.63.

The most important details are the formulas used to calculate the amount to be invested today, the sales expected to be made after 6 years, the implied rate of interest, and the time taken to save money for a new car. The initial investment is R300,000 and the rate of interest is 11%. The amount needed after t years is R400,000 and the time taken to save money is 4.73 years.

2.1) Calculation of the amount to be invested today: Given, the amount needed for the education of daughter is R170,000 and she will need it after 15 years.The expected rate of return is 8.5% per year.Using the formula:

Future Value = Present Value * [1+rate]^nFuture value = R170,000Present Value = ?Rate = 8.5%Time = 15 years

Future value = Present value * [1 + rate]^n170000

= Present value * [1 + 0.085]^15Present value = R56,453.74

Therefore, the amount that the person needs to invest today is R56,453.742.2)

Calculation of the sales expected to be made after 6 years:Given, the sales of widgets made in 1 year are 2 million.The expected increase in sales is 16% per year for the next 6 years.

Using the formula for the compound amount:

Final amount = P(1 + r/n)^(nt)

P = Principal Amount

r = rate of interest

n = number of times per year compounded

t = time in years2,000,000(1 + 0.16/1)^(6*1) = 7,170,881.942

Therefore, the number of widgets expected to be sold in 6 years is 7,170,881.942.2.3) Calculation of the implied rate of interest:Given, R1,500 will be received in 4 years if R800 is invested today.Using the formula to calculate interest rate:

Simple interest formula :I = PRT/100

I = Interest

P = Principal Amount

R = Rate of Interest

T = TimeI = R * P * T

Given, I = R1,500P = R800T = 4 years R = I/P*T = (1500/800*4) = 0.46875Rate of Interest = 46.875%

Therefore, the implied rate of interest is 46.875%.2.4) Calculation of time taken to save money for a new car:Given, a new car is worth R400,000.The investment at the rate of 11% per year is being made.Initial investment is R300,000Let the time taken to save money for a new car be 't' years.Using the formula:

Amount = Principal Amount * [1 + Rate of Interest]^(Number of years)

New car price = R400,000Principal Amount = R300,000Rate of Interest = 11%Amount needed after t years = R400,000

\(Principal Amount = Amount needed after t years / [1+ Rate of Interest]^tPrincipal Amount\)

\(= 400,000 / [1.11]^t300,000*[1.11]^t\)

\(= 400,000[1.11]^t\)

= 4/3t

= 4.73 years

Therefore, the time taken to save the money for the new car is 4.73 years.

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Answer:

Subtract the interior angle from 180. For example, if the interior angle was 165, subtracting it from 180 would yield 15. Divide 360 by the difference of the angle and 180 degrees. For example, 360 divided by 15 equals 24, which is the number of sides of the polygon.

Step-by-step explanation:

brainliest please!!!!

Answer:

x = 5

Step-by-step explanation:

Simplify. First, combine like terms:

3x - x + 2 = 12

(3x - x) + 2 = 12

(2x) + 2 = 12

2x + 2 = 12

Isolate the variable, x. Note the equal sign, what you do to one side, you do to the other. Do the opposite of PEMDAS.

PEMDAS =

Parenthesis

Exponents (& Roots)

Multiplication

Division

Addition

Subtraction

& is your order of operation.

First, subtract 2 from both sides:

2x + 2 (-2) = 12 (-2)

2x = 12 - 2

2x = 10

Next, divide 2 from both sides:

(2x)/2 = (10)/2

x = 10/2

x = 5

5 is your answer for x.

Check: Plug in 5 for x in the equation. Solve:

3(5) - (5) + 2 = 12

15 - 5 + 2 = 12

10 + 2 = 12

12 = 12 (True)

~

Answer:

x = 5

Step-by-step explanation:

Combining like terms, we get 2x = 10.  Dividing both sides by 2 yields

x = 5

Answer:

yes

Step-by-step explanation:

Substitute x = - 3 and y = 2 into the left side of the inequality and compare the value obtained with the right side.

- 3 - 5(2) = - 3 - 10 = - 13 < 7

Thus (- 3, 2) is a solution of the inequality

Answer:

B

Step-by-step explanation:

To find the length of the longest side of the triangle, first sketch the triangle. A graph paper is not needed here.

In this case we have a right-angled triangle, since the ends of the adjacent side has the same y-coordinate of 1 and the opposite side has the same y-coordinate of 5.

In a right-angled triangle, the hypotenuse side is the longest. The length of the hypotenuse side can be found using 2 methods.

1) Pythagoras' Theorem

a² +b²= c²

(adjacent)² +(opposite)²= (hypotenuse)²

Length of adjacent

= 5 -(-2)

= 7 units

Length of opposite side

= 4 -1

= 3 units

(hypotenuse)²

= 7² +3²

= 58

hypotenuse= \( \sqrt{58} \)

2) Distance formula

Since we know that the hypotenuse side is the longest, we can simply find the length of the hypotenuse side instead of calculating the length of each side.

\(\boxed{{\text{Distance between 2 points}= \sqrt{(y_1 - y_2)^{2} + (x_1 - x_2)^{2} } }}\)

Length of longest side

= distance between (5, 4) and (-2, 1)

\( = \sqrt{(4 - 1) {}^{2} + (5 - ( - 2)) {}^{2} } \)

\( = \sqrt{3 {}^{2} + {7}^{2} } \)

\( = \sqrt{58} \)

Thus, the length of the longest side is \( \sqrt{58} \) units.

Answer:

25,1.01×0.25y+×=0.35

Step-by-step explanation:

tan po ang sagot ,best at math,english,angmd scinece,po

kasi pinsan ko is nag torture sa akin po‍‍

Miss Johnson has in her classroom closet 32 boxes with 245 counters. SheQuestion #4Miss Johnson has in her classroom closet 32 boxes with 245 counters. She wo

to redistribute them and share them equally in 25 bags for a class activity.

a) How many counters will she put in each bag?

b) Will she have any counters left? If yes, how many? wo

to redistribute them and share them equally in 25 bags for a class activity.

a) How many counters will she put in each bag?

b) Will she have any counters left? If yes, how many?

(Hey, angles rock!)

Answer:

45 + 60 = 105

Step-by-step explanation:

ABC consists of two angles, angle ABD and angle DBC. Therefore, the sum of the measures of angles ABD and DBC is the measure of ABC.

45 + 60 = 105

the empirical probability based on 1000 flips provides a better estimate of the theoretical probability p(h) for the unfair coin.

The empirical probability is based on observed data from actual trials or experiments. It involves calculating the ratio of the number of favorable outcomes (e.g., getting a "heads") to the total number of trials (flips). The larger the number of trials, the more reliable and accurate the estimate becomes.

When estimating the theoretical probability of an unfair coin, it is important to have a sufficiently large sample size to minimize the impact of random variations. With a larger number of flips, such as 1000, the estimate is based on more data points and is less susceptible to random fluctuations. This helps to reduce the influence of outliers and provides a more stable and reliable estimate of the true probability.In contrast, with only 30 flips, the estimate may be more affected by chance variations and may not fully capture the underlying probability of the coin. Therefore, the empirical probability based on 1000 flips provides a better estimate of the theoretical probability p(h) for the unfair coin.

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Answer:

Experimental probability

Step-by-step explanation:

Experimental probability is a probability that is determined on the basis of a series of experiments. A random experiment is done and is repeated many times to determine their likelihood and each repetition is known as a trial.

The first option, A BC^2 - AB^2 = AC^2, is true. This is a special case of the Pythagorean Theorem, which states that for a right triangle, the sum of the squares of the two shorter sides (A and B) is equal to the square of the longest side (C). In this case, BC^2 - AB^2 = AC^2.

The first option, A BC^2 - AB^2 = AC^2, is true. This special case of the Pythagorean Theorem states that for any right triangle, the sum of the squares of the two shorter sides (A and B) is equal to the square of the longest side (C). In other words, BC^2 - AB^2 = AC^2. This theorem has been used for centuries by mathematicians and builders, as it is a reliable way to measure and construct the sides of a triangle. The theorem is also useful in applications such as computer graphics, where it is used to calculate the dimensions of a triangle on a two-dimensional plane. By understanding the principles of the Pythagorean Theorem, one can accurately measure and construct triangles of any size and shape.

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The first option, A BC^2 - AB^2 = AC^2, is true. This is a special case of the Pythagorean Theorem, which states that for a right triangle, the sum of the squares of the two shorter sides (A and B) is equal to the square of the longest side (C). In this case, BC^2 - AB^2 = AC^2.

The first option, A BC^2 - AB^2 = AC^2, is true. This special case of the Pythagorean Theorem states that for any right triangle, the sum of the squares of the two shorter sides (A and B) is equal to the square of the longest side (C). In other words, BC^2 - AB^2 = AC^2. This theorem has been used for centuries by mathematicians and builders, as it is a reliable way to measure and construct the sides of a triangle. The theorem is also useful in applications such as computer graphics, where it is used to calculate the dimensions of a triangle on a two-dimensional plane. By understanding the principles of the Pythagorean Theorem, one can accurately measure and construct triangles of any size and shape.

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Answer:

4. 2 nonreal solutions.

Step-by-step explanation:

We need to use discriminant,

for ax²+bx+c=0

The discriminat is b²-4ac

If the discriminant is,

→ less than 0, then 0 real solutions

→ equal to 0, then 1 real solutions

→ more than 0, then 2 real solutions

Given that,

7x²-4x+3=0

a=7, b=-4, and c=3

→ (-4)²-4(7)(3)

→ 16-84

→ -68

You can see this is less than 0, then non real solutions. [2 nonreal solutions]

Answer:

150

Step-by-step explanation:

To figure out how far it turns in one hour divide 360 and 24= 15, now to find out how much it turns in 10 hours multiply 10x15=150