If Alfonso has 9 quarters and nickels in his pocket, and they have a combined value of 145 cents, how many of each coin does he have?

PLEASE HELP!!! IM GIVING 20 POINTS!! THANKSSSS

The correct answer is d. standard error.the standard deviation of a sampling distribution of sample means is referred to as the standard error.

The standard deviation of a sampling distribution of sample means is commonly referred to as the standard error. It represents the variability or dispersion of the sample means around the population mean. The standard error quantifies the precision of the sample mean as an estimate of the population mean.

The sampling distribution of sample means is a theoretical distribution that shows the distribution of sample means obtained from multiple random samples of the same size taken from a population. It is an essential concept in inferential statistics, particularly when estimating population parameters.

The standard error is calculated by dividing the standard deviation of the population by the square root of the sample size. Mathematically, it is represented as:

Standard Error = (Population Standard Deviation) / √(Sample Size)

The standard error measures the average amount of deviation or error between the sample means and the population mean. A smaller standard error indicates less variability and greater precision in estimating the population mean. On the other hand, a larger standard error implies more variability and less precision.

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Answer:

1 : 1

Step-by-step explanation:

PQ parallel to RS

PR and PS ; perpendicular to PQ and RS

FOR parallel lines, the perpendicular line joining then are always the same ; here the 4 angles formed are all 90°

Answer:

1:1

Step-by-step explanation:

Answer:

$96.

Step-by-step explanation:

5/6  costs 80

Multiply both parts by 6/5:

5/6 * 6/5 ( = 1 ) costs 80 * 6/5

= 16 * 6

= $96.

Answer:

  see attached

Step-by-step explanation:

Given the pictorial equations, you want to know the single-digit values of each of the images.

There are 6 equations in 5 unknowns, but no numerical values are assigned. Solving the equations will only give ratios of values. From those, we need to determine the numerical values that will keep all numbers in the range 1–9.

Let the icons be represented by letter variables as follows:

Rewriting the equations to standard form, we have ...

  h +b -m -s = 0 . . . . . [eq1]

  h -b +t = 0 . . . . . . . . [eq2]

  b -3s = 0 . . . . . . . . . [eq3]

  h -s -t +m = 0 . . . . .  [eq4]

  h +2s -m = 0 . . . . . . [eq5]

  h +b +s -2t = 0 . . . . . [eq6]

We can add [eq4] to [eq1] and [eq5] to eliminate the m variable.

  (h +b -m -s) +(h -s -t +m) = 0   ⇒   2h +b -2s -t = 0 . . . . [eq7]

  (h +2s -m) +(h -s -t +m) = 0   ⇒   2h +s -t = 0 . . . . . . . . . [eq8]

Adding [eq2] to [eq6], and [eq7] will eliminate the b variable.

  (h +b +s -2t) +(h -b +t) = 0   ⇒   2h +s -t = 0 . . . . same as [eq8]; no help

  (2h +b -2s -t) +(h -b +t) = 0   ⇒   3h -2s = 0 . . . . . [eq9]

Now, we have 3 equations in 4 unknowns:

  b -3s = 0 . . . . . . . [eq3]

  3h -2s = 0 . . . . . . [eq9]

  2h +s -t = 0 . . . . . [eq8]

The smallest positive integer values that will satisfy [eq9] are ...

  h = 2, s = 3

Using these in the remaining equations gives ...

  b -3·3 = 0   ⇒   b = 9

  2·2 +3 -t = 0   ⇒   t = 7

And we can find m using [eq5]:

  m = h +2s = 2 +2·3 = 8

Then the solution is ...

The integral is ∫ x sec x tan x dx. We can solve it using integration by parts xln|sec(x) + tan(x)| - x + C

We have u = x, dv = sec(x)tan(x)dx, du = dx, and v = ln|sec(x) + tan(x)|.

The integral is then

Integrating the second part we get:

xln|sec(x) + tan(x)| - x + C

The integral is ∫ x sec x tan x dx. We can solve it using integration by parts. We let u = x and dv = sec(x)tan(x)dx. Then, du = dx and v = ln|sec(x) + tan(x)|. So, the integral becomes xln|sec(x) + tan(x)| - ∫ ln|sec(x) + tan(x)| dx. We can integrate the second part to get xln|sec(x) + tan(x)| - x + C.

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Step-by-step explanation:

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Answer:

x>23/5 is the answer

Step-by-step explanation:

5x - 11 > 12

5x > 12 + 11

5x > 23

x > 23/5

Friend has made a calculation error

Answer:

because 2+2 is 4

Step-by-step explanation:

Answer:

2h+4=b

Step-by-step explanation:

h stands for how many bows hannah has, and b stands for how many bows bianca has. bianca has four more than twice the amount of bows as hannah, so you double hannah's amount, and add four!

Answer:

350

Step-by-step explanation:

if you take 500-10 that gives you 490 left to cure if 7 of those 10 are cured the 350 out of the total mice would be cured.   if it is not the correct answer i am sorry that is just how I was taught to do it.

Answer: \(x=\Large\boxed{\frac{2}{5} }\)

Step-by-step explanation:

Given equation

\(-5x-(-6-4x)=-2(3x-4)\)

Expand the parenthesis

\(-5x+6+4x=-2\times3x-2\times(-4)\)

\(-5x+6+4x=-6x+8\)

Combine like terms

\(-x+6=-6x+8\)

Add 6x on both sides

\(-x+6+6x=-6x+8+6x\)

\(5x+6=8\)

Subtract 6 on both sides

\(5x+6-6=8-6\)

\(5x=2\)

Divide 5 on both sides

\(5x/5=2/5\)

\(x=\Large\boxed{\frac{2}{5} }\)

Hope this helps!! :)

Please let me know if you have any questions

it is 3^1 x 3^7

youre welcome

Answer:

C) 3^1 x 3^7

Step-by-step explanation:

Answer:

A: 2x-1

Step-by-step explanation:

Graph it. if you plug in the x and y of (1,1)

1= 2(1)-1

1=2-1

correct

Answer: A

Step-by-step explanation:

Since we are given the slope, all we have to do is use the given point to find the y-intercept.

y=2x+b                 [plug in (1,1)]

1=2(1)+b                [multiply]

1=2+b                   [subtract both sides by 2]

b=-1

Now, we know the equation is y=2x-1.

The workers would need 3.71 weeks to repair the road.

A generalization of arithmetic in which letters representing numbers are combined using arithmetic rules

Given that the total length of the road is 13km. Workers can repair 3.50 roads per week.

To determine the number of weeks required to repair the road, divide the total by per week. The equation would be:

13 ÷ 3.5

= (13 x 10)/35

= 130/ 35

= 3.71

Therefore the workers would need 3.71 weeks to repair the road.

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Answer:

Please check explanations

Step-by-step explanation:

When we dilate a particular figure, we are simply increasing the dimensions of its sides

By dilating the pre-image by a factor of 3, we are simply increasing the dimensions of it by a multiple of 3

so say for example, the base of the pre-image has a measure of 4 ft, the base of the image which is the pre-image dilated by a scale factor of 3 will be 4 ft * 3 = 12 ft

What this mean is that we have succeeded in tripling the dimension of the pre-image to give the dimension of the image

Answer:

-8

Step-by-step explanation:

The opposite of a positive integer is a negative integer so it must be -8

The speed of boat is 14 miles per hour and the speed of current 35 mile per hour

Speed:

The general formula to calculate the speed is written as

Speed = Distance/Time

Given,

A boat travel 42 mile uptream in 3 hour looking for a lot diver. It then travel downstream 70 mile in 2 hour.

Here we need to find the speed of boat and the speed of current.

While we looking into the given question, we have identified the following values,

Distance = 42 mile

time = 3 hour

Then the speed is calculated as,

=> speed = 42/3

=> speed = 14 miles per hour

Similarly, for the current is

distance = 70 miles

time = 2 hour

Then the speed is calculated as,

=> speed = 70/2 = 35 miles per hour.

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Answer:

For example

Here Domain and range both are set of all real numbers

The number -3(5) will equal the -15 which is written in latex as \(-15\) so option (A) will be correct.

Multiplication is the general procedure in mathematics in which we multiply two or more numbers to each other to find a new multiplied number.

Multiplication gives us a resultant number that will be very big as compared to the number which is going to be multiplied if and only if the number which is going to be multiplied is more than one.

Given that, - 3(5)  

since we know in multiplication if you multiply by - and + than the result will be on only - so

-3(5)  = -3×5 = -15 = \(-15\)

Hence, the correct answer will be \(-15\)

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Answer:

47 2/9

hope this help :)

Answer:

47 2/9

Step-by-step explanation:

( 14 + 25 + 7) + ( 4/9 + 1/6 + 11/18)

46 + 11/9

46 + 1 2/9

47 2/9

The length of the main diagonal of the cube is (3√6)/2 metres.

To find the length of the main diagonal, we first find the length of the diagonal of one face using the Pythagorean theorem. Then, we multiply this length by √6 to account for all six faces of the cube. Finally, we simplify the expression to get the final answer.

The main diagonal of a cube is the diagonal connecting any two opposite vertices of the cube. To find the length of the main diagonal, we start by using the Pythagorean theorem to find the length of the diagonal of one face of the cube. We know that the side length of the face is √3/2 metres, so we calculate (√3/2)^2 + (√3/2)^2 = 3/4 + 3/4 = 3/2 metres.

Since a cube has six faces, we multiply this length by √6 to account for all six faces. Simplifying the expression (√6) * (3/2) gives us the length of the main diagonal as (3√6)/2 metres.

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Step-by-step explanation:

The equation of the line perpendicular to the line y = -3x + 6 and passing through the point (-2,8) is y = (1/3)x + (10/3).

The process of finding the derivative of a function is called differentiation.

Differentiation is a fundamental concept in calculus that involves determining the rate at which a function changes with respect to its independent variable. It allows us to analyze the behavior of functions, such as finding slopes of curves, identifying critical points, and understanding the shape of graphs.

The derivative of a function represents the instantaneous rate of change of the function at any given point. It provides information about the slope of the tangent line to the graph of the function at a specific point.

The notation used to represent the derivative of a function f(x) with respect to x is f'(x) or dy/dx. The derivative can be interpreted as the limit of the difference quotient as the interval approaches zero, representing the infinitesimal change in the function.

By applying differentiation techniques, such as the power rule, product rule, chain rule, and others, we can find the derivative of a wide range of functions. Differentiation is a powerful tool used in various areas of mathematics, physics, engineering, economics, and other fields to analyze and solve problems involving rates of change.

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The given distribution, with the probability density function f(x; θ) = (θ¹)(1 − x)ᵀ, where 0 < x < 1 and θ > -1, is an exponential family.

How can we show that the given distribution is an exponential family?

To show that the distribution is an exponential family, we need to express its probability density function (pdf) in the general exponential family form. Let's analyze the components of the exponential family.

The natural parameter for this distribution is θ.

The sufficient statistic is ln(x), the natural logarithm of x.

The log-normalization constant can be found by integrating the pdf over the support of the distribution.

The carrier measure is zero.

By expressing the given pdf in the form f(x; θ) = exp[c(θ)T(x) + d(θ)], where c(θ) = θ, T(x) = ln(x), and d(θ) is the log-normalization constant, we can see that the distribution satisfies the criteria for an exponential family.

Therefore, the answer is that the given distribution is an exponential family.

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Answer:

  (d)  6.3

Step-by-step explanation:

You want the measure of side CD in ∆CDE ~ ∆CFG with CG=6, GE=2.4, and FD=1.8.

The corresponding sides of the two triangles are proportional:

  CD/CE = FD/GE

  CD = CE×FD/GE = (6+2.4)×1.8/2.4

  CD = 6.3

__

Additional comment

Lengths on segment CD are 3/4 of those on segment CE, so CF = 4.5. CD is the sum of CF and FD: 4.5 +1.8 = 6.3.

Answer: x=10

Step-by-step explanation:

Supplementary angles 142+2(x+9)=180

Subtract 142 frrom both sides

2(x+9)=38

now distribute

2x+18=38

subtract again

2x=20

Divide both sides by 2

x=10

The correct logarithm form is: a. log5 125 = 3

Question is about finding the logarithm form of 5³ = 125 using the given options.

The correct logarithm form is:

a. log5 125 = 3

Here's the step-by-step explanation:

1. The exponential form is given as 5³= 125.
2. To convert it to logarithm form, you have to express it as log(base) (argument) = exponent.
3. In this case, the base is 5, the argument is 125, and the exponent is 3.
4. Therefore, the logarithm form is log5 125 = 3.

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Answer:

It's quite easy

Step-by-step explanation:

people less than 30 years = frequency of people 0 to 15 + 15 to 30 = 8+15 =23

Therefore there are 23 people less than 30 years old.

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