1) In a sample of 25 iPhones, 12 had over 85 apps downloaded. Construct a 90% confidence interval for the population proportion of all iPhones that obtain over 85 apps.
Assume z0.05 = 1.645.
a) 0.48 ± 0.16
b) 0.48 ± 0.09
c) 0.29 ± 0.15
d) 0.29 ± 0.16

The equation y = 2x + 4 has the following missing value: 3.

The x and y values of an ordered pair whose values, if substituted into the equation, would make it true are the answer to the given equation.

According to the Given information

If the value of x is the missing value in the solution to the equation y = -2x + 4, and the solution is (x, -2) Hence, by adding y = -2 to the equation and solving for x, the value of x can be found:

-2 = -2x + 4

Take 4 away from both sides.

-2 - 4 = -2x + 4 - 4 (subtraction property of equality)

-6 = -2x

Add -2 to both sides.

-6/-2 = -2x/-2

3 = x

x = 3

The equation y = 2x + 4 has the following missing value: 3.

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It depends on the type of function, however there are patterns that can be found

A general rule of thumb to consider is as follows

f(x) + d shifts a function up d units

f(x) - d shifts a function down  d units

Ex. [tex]f(x) = x^{2} +3[/tex] shifts up 3 units, and [tex]f(x) = 2x - 4[/tex] shifts down four units

f(x+c) shifts a function left c units

f(x-c) shifts a function right c units

EX. [tex]f(x) = (x+2)^{2}[/tex] shifts left 2 units, and [tex]f(x) =(x-7)^{2}[/tex] shifts right 7 units

-f(x) is a reflection over the x-axis

EX. [tex]f(x) = x^{2}[/tex] opens up, while [tex]f(x) = -x^{2}[/tex] opens down

These guidelines can also be combined

EX. [tex]f(x) = -(x-4)^{2} + 3[/tex] opens down, is shifted right 4 units, and is shifted up 3 units from the parent function

The number of pizza expected to be eaten is equal to the number of persons that attends the party and this is equal to 0.8gp/s

From the problem it can be deduced that

number of people invited to the party = g

number of people attending

= 80% of people invited to the party

= 80% of g

and 80% = 80 / 100 = 0.8

therefore,

= 0.8g

You estimate that your guests will each eat p pieces of pizza

= 0.8g * p

= 0.8gp

and each pizza has s slices

the number of slices = s

the number of pizza to be taken is  0.8gp/s

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Answer:

Step-by-step explanation:

Newton's method is an iterative method for finding the roots of a function, which means that it can be used to find the values of x that make a function equal to zero. It can also be used to find the maximum or minimum values of a function, but to do so you will need to find the derivative of the function and use that to determine where the maximum or minimum values occur.

The derivative of the function f(x) = 7x cos(x) is f'(x) = 7 cos(x) - 7x sin(x), and you can use this to find the maximum value of the function. To do this, you would need to find the values of x that make the derivative equal to zero, since the maximum or minimum values of a function occur at the points where the derivative is equal to zero.

To find the values of x that make the derivative equal to zero, you can use Newton's method, which involves starting with an initial guess for the value of x, and then using the derivative to find a better approximation for the value of x. This process is repeated until the desired level of accuracy is reached.

In your case, you could start by making an initial guess for the value of x that makes the derivative equal to zero. For example, you could start with x = 0 and then use the derivative to find a better approximation. This process would involve calculating the derivative at the initial guess, and then using that value to find a better approximation for the value of x. This process would be repeated until the desired level of accuracy is reached.

Once you have found the values of x that make the derivative equal to zero, you can plug those values back into the original function to find the maximum value of the function. This will give you the absolute maximum value of the function f(x) = 7x cos(x), 0 ≤ x ≤ , correct to six decimal places.

The coordinates of S(x₁, y₁)=(3/2 , 5) if F(0, 2) and G(2,6) and the lines divided in the ratio 1:3

Finding the ratio by which a line segment is divided by a point internally or externally in coordinate geometry is done using the Section formula. The centroid, incenter, and ex center of a triangle are determined using it. Finding systems' centers of mass, equilibrium locations, etc. are all done using this method in physics. Finding the ratio by which a line segment is divided by a point internally or externally in coordinate geometry is done using the Section formula. The centroid, incenter, and ex center of a triangle are determined using it.

Given,

F(0, 2) and G(2, 6)

And also given that the points S lies on the way along FG then:

The lines divides the ratio,

1:3= m:n

Here we have to find the coordinates of S, we get:

S(x₁, y₁)=((mx₁+n x₂)/(m+ n), (my₁+n y₂)/(m+ n))

=((1(0)+3(2))/4 , (1(2)+3(6))/4)

=(6/4 , 20/4)

=(3/2 , 5)

S(x₁, y₁)=(3/2 , 5)

Therefore, the coordinates of S(x₁, y₁)=(3/2 , 5).

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Solution of equation 3x² = -2x+ 4 using the quadratic formula x = -1± √13/3.

The definition of a quadratic as a second-degree polynomial equation demands that at least one squared term must be included. It also goes by the name quadratic equations. The quadratic equation has the general form ax² + bx + c = 0. where a, b, and c are numerical coefficients and x is an unknown variable. Due to the fact that the Latin word quadratum, which means "square," and the fact that the area of a square with side length x is equal to x², a polynomial equation with exponent two is referred to as a quadratic ("square-like") equation.

Given,

Equation

3x² = -2x+ 4

3x² + 2x - 4 = 0

Using quadratic formula,

x = -2 ± √2²- 4 × 3(-4)/ 2× 3

Simplifying:

x = -2 ± 2√13/6

Equations:

x = -2 + 2√13/6

x = -2 - 2√13/6

x = -1 + √13/3

x = -1 - √13/3

x = -1± √13/3

Solution of equation 3x² = -2x+ 4 using the quadratic formula x = -1± √13/3.

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Answer: Yes

Step-by-step explanation:

4*10=40

3*10=30

Which means that they are of equal proportion.

Exactly 5/12 of a full rotation is 150, where full rotation is 360.

A "full rotation," "revolution," "whole turn," or "full circle" describes this. It entails spinning around till you are once again pointing in the same direction. a rotational movement. In rotation, there is a fixed central point around which everything else revolves in a circle. 360° is a "Full Rotation." Each point in a figure is transformed into a rotation by rotating it a specific amount of degrees around another point.

Given,

Number = 5/12

Full rotation = 360

5/12 of full rotation

5/12 × 360

5 × 30

150

Exactly 5/12 of a full rotation is 150, where full rotation is 360.

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Answer: C is the correct answer!I don't feel like explaining. sorry.Please let me know if I am wrong.

Answer:

Step-by-step explanation:

sorry, i'm not a college student, so i don't know how to answer this.

Answer:

The square root of 75 can be written as √75. To simplify this expression, we can use the property that the square root of a product is equal to the product of the square roots of the factors. In this case, we can factor 75 as the product of 25 and 3:

√75 = √(25 x 3)

We can then apply the property of the square root of a product to simplify the expression:

√75 = √(25 x 3) = √25 x √3

We can further simplify the expression by applying the property that the square root of a perfect square is equal to the number itself. Since 25 is a perfect square, we can simplify √25 to 5:

√75 = √(25 x 3) = √25 x √3 = 5 x √3

Therefore, the simplified form of √75 is 5 x √3. This means that the square root of 75 is equal to 5 times the square root of 3.

Step-by-step explanation:

In the given right angled triangle ABC, the value of x is equal to 10.7 (round to the nearest tenths place).

As given in the question,

In the triangle ABC,

Triangle ABC is right angled triangle with ∠C = 90°

Measure of angle A = 68degrees

AC = 4 units

AB = x units

Using trigonometric ratio,

cos 68° = AC / AB

⇒cos 68° = 4 / x

⇒ 0.3746 = 4 / x

⇒ x = 4 / 0.3746

⇒ x = 10.68

⇒ x = 10.7 ( round to the nearest tenths place)

Therefore, in triangle ABC , the value of x is equal to 10.7(round to the nearest tenths place).

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Answer:

the answer to the division problem is `1x + 6` (a polynomial).

Step-by-step explanation:

To divide polynomials, we use the long division method. Here's how we can divide x² - 36 by x - 6:

x² - 36  |

--------

x - 6

First, we divide the leading coefficient of the numerator (which is 1) by the leading coefficient of the denominator (which is 1).

We get 1 / 1 = 1 as the first coefficient of our quotient.

x² - 36  |

--------

x - 6

  1

Then, we multiply the quotient by the denominator and subtract it from the numerator.

We get (1 * (x - 6)) = x - 6, and x² - 36 - (x - 6) = x² - x - 30.

x² - 36  |

--------

x - 6

  1

      x - 6

----------

 x² - x - 30

We repeat the process, dividing the leading coefficient of the new numerator (which is 1) by the leading coefficient of the denominator (which is 1).

We get 1 / 1 = 1 as the next coefficient of our quotient.

x² - 36  |

--------

x - 6

  1

      x - 6

----------

 x² - x - 30

   1

We multiply the quotient by the denominator and subtract it from the numerator.

We get (1 * (x - 6)) = x - 6, and x² - x - 30 - (x - 6) = x² - 2x + 24.

x² - 36  |

--------

x - 6

  1

      x - 6

----------

 x² - x - 30

   1

      x - 6

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

x² - 2x + 24

We repeat the process one more time, dividing the leading coefficient of the new numerator (which is 1) by the leading coefficient of the denominator (which is 1).

We get 1 / 1 = 1 as the next coefficient of our quotient.

x² - 36  |

--------

x - 6

  1

      x - 6

----------

 x² - x - 30

   1

      x - 6

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

x² - 2x + 24

   1

We multiply the quotient by the denominator and subtract it from the numerator.

We get (1 * (x - 6)) = x - 6, and x² - 2x + 24 - (x - 6) = x² - 3x + 18.

x² - 36  |

--------

x - 6

  1

      x - 6

----------

 x² - x - 30

   1

      x - 6

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

x² - 2x + 24

   1

      x - 6

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

x² - 3x + 18

Since the degree of the new numerator is less than the degree of the denominator, we have found the complete quotient.

So, the quotient is `1x + 6`, and the remainder is `x² - 3x + 18`.

Therefore, the answer to the division problem is `1x + 6` (a polynomial).

Answer:

x + 6

Step-by-step explanation:

[tex]\frac{x^{2} -36}{x-6}[/tex]

[tex]\frac{(x+6)(x-6)}{x-6}[/tex]

x + 6

One centimeter is equivalent to 10 millimeters.  

Converting the cm to mm

10mm:10mm

The scale factor is 1:1 because the two are equal

Hope this helps :)

If you need any more explanation, feel free to ask.  If this really helps, consider marking brainliest.

- Jeron

Answer: x<_9

Step-by-step explanation:

subtract 15 from both sides then subtract 15 from 60 and get 45. Divide both sides by 5 since 5 is positive the inequality direction remains the same. divide 45 by 5 to get 9.

The 95% confidence interval for true average CO2 level in the population of all homes from which the sample was selected is given as follows:

(612.05, 696.27).

The interpretation is that we are 95% sure that the population mean is between these two values.

The confidence interval is obtained using the t-distribution, as we have the standard deviation for the sample instead of the standard deviation for the population.

The bounds of the interval are given by the equation presented as follows:

[tex]\overline{x} \pm t\frac{s}{\sqrt{n}}[/tex]

In which the variables of the equation are presented as follows:

The critical value, using a t-distribution calculator, for a two-tailed 95% confidence interval, with 60 - 1 = 59 df, is t = 2.0010.

The remaining parameters are given as follows:

[tex]\overline{x} = 654.16, s = 163.02, n = 60[/tex]

Hence the lower bound of the interval is of:

654.16 - 2.001 x 163.02/sqrt(60) = 612.05.

The upper bound of the interval is of:

654.16 + 2.001 x 163.02/sqrt(60) = 696.27.

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Answer:

In rectangular form, a complex number is expressed as $x + yi$, where $x$ and $y$ are the real and imaginary parts, respectively. The conversion from polar form to rectangular form is done using the following equations:

$x = r \cos \theta$

$y = r \sin \theta$

where $r$ is the magnitude (or modulus) of the complex number and $\theta$ is the argument (or phase) of the complex number.

In the given problem, we are given the complex number $z = 3(cos(7pi/6)+ i sin (7pi/6))$. We can write this in polar form as $z = 3 \cdot cis(7pi/6)$, where $cis(x) = cos(x) + i \cdot sin(x)$. Thus, we have $r = 3$ and $\theta = 7pi/6$. Using the equations above, we can convert this to rectangular form to obtain:

$x = r \cos \theta = 3 \cos (7pi/6) = -\frac{3}{2}$

$y = r \sin \theta = 3 \sin (7pi/6) = \frac{\sqrt{3}}{2}$

Therefore, the rectangular form of the complex number is $-\frac{3}{2} + \frac{\sqrt{3}}{2} i$.

Answer:

1686 euro/m²

Step-by-step explanation:

$192/ft² × euro/$1.225 × (3.28 ft)²/(1 m)² = 1686 euro/m²

The value of x that makes the inequality true is: D. √0.02.

If we are given an inequality statement, the value of the variable of the inequality must be such that makes the statement true, which is the possible set of values of the variable.

Given that 1/8 < x < 18%, note the following:

1/8 = 0.125

18% = 0.18

This means that, 0.125 must be less than the value of x, while the value of x must be less than the value of 0.18, for the inequality to be true.

Considering the options given, 1/5 = 0.2. 0.2 is greater than 0.18 (18%).

1.6 is also greater than 0.18 (18%) and 1/8 (0.125).

1/8(0.125) is greater than 0.09.

Thus, √0.02 is approximately 0.14.

1/8 (0.125) < 0.14 < 18% (0.18). Therefore the value of x would be: D. √0.02.

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The cost of turkey per pound is $1.35 and the equation which represents the situation is 19x - 25.65  = 0.

What is the linear equation?

An algebraic equation of the form y=mx+b is referred to as a linear equation. m is the slope, and b is the y-intercept, and all that is involved is a constant and a first-order (linear) term. The variables in the preceding equation are y and x, and it is occasionally referred to as a "linear equation of two variables."

We have,

19 turkey pound

$25.65

the cost of turkey per pound?

so,

25.65 / 19 = 1.35

the cost of turkey per pound is $1.35.

The equation becomes:

let's take x = $1.35

19x - 25.65  = 0

Hence, the cost of turkey per pound is $1.35 and the equation which represents the situation is 19x - 25.65  = 0.

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If the two functions be g(x) = x + 2 and h(x) = 3x - 3 then

(h - g)(x) = 2x - 5

(h + g)(x) = 4x - 1

(h . g)(1)  = 3x² + 3x - 6

A phrase is considered a mathematical expression if it contains at least two numbers or variables and one or more mathematical operations. Mathematicians can multiply, divide, add, or subtract. An expression is structured as follows: (Math Operator, Number/Variable, Math Operator) is an expression.

Mathematical expressions are built using the addition, subtraction, multiplication, and division operations.

Let the two functions be g(x) = x + 2 and h(x) = 3x - 3

(h - g)(x) = h(x) - g(x)

substitute the value expressions in the above equation, we get

= (3x - 3) - (x + 2)

= 2x - 5

(h + g)(x) = h(x) + g(x)

= (3x - 3) + (x + 2)

= 4x - 1

(h . g)(1) = h(1) . g(1)

= (3x - 3) . (x + 2)

= 3x² + 3x - 6

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Answer:

  C)  Always

Step-by-step explanation:

You want to know the values of x for which y is negative, given that y = -|x -2| -4.

The absolute value function always returns a non-negative value. Its minimum value is 0, which will occur for x=2 in this function.

When the absolute value function is negated, as here, the largest the result can be is zero—for any value of x. When 4 is subtracted from that, the largest the value of y can be is -4, again, for any value of x.

  y is always less than 0.

The attached graph should help you see the vertex (maximum) of the function is (2, -4), and it opens downward. It is negative for all values of x.

The equivalent expressions are:

1. C. 1/15x - 14y

2. B. 2x - 4 - 10x + 15

3. The expression we can use are:

64 + 64(0.015)

4. The expressions that represent the sale price are:

0.7p

p - 0.3p

(1 - 0.3)p

If the simplest form of two expressions have the same value, then they are equivalent expressions.

1. Simplify 2/5x - 3y - 1/5x - 11y by combining like terms to determine the expression that is equivalent to it:

2/5x - 1/5x - 3y - 11y

1/15x - 14y

The answer is: C. 1/15x - 14y

2. Simplify 2(x - 2) - 5(2x - 3), by first opening the parentheses:

2x - 4 - 10x + 15

The equivalent expression is: B. 2x - 4 - 10x + 15

3. The percentage error allowed is 1.5% = 1.5/100 = 0.015.

Therefore, the expression we can use are:

64 + 64(0.015)

4. 30% is, 30/100 = 0.3.

Original price = p = $100.

0.3 of $100 = 0.3(100) = $30

Sale price = 70% of original price = 0.7(100) = $70.

Therefore, the expressions of the sale price of the bicycle are:

0.7p

p - 0.3p

(1 - 0.3)p

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-7 ≥-10 follows the given condition because -7 is greater that -10. So the given point (10,-7) is a solution of y ≥-0.5x-5.

In the given question, we have to explain (10,-7) is a solution of y ≥-0.5x-5 or not.

The given point is (10,-7).

The given inequality is y ≥-0.5x-5.

To check whether the given point is solution of the given inequality or not we put the value of x and y from the given point.

As we know that in the given point one value is representing the value of x and one of y.

So, after putting the value we simplify the inequality. If it follows the given condition then the given point is the solution of the inequality else it is not.

Now putting the value of x and y in the inequality.

-7 ≥-0.5(10)-5

Simplifying

-7 ≥-5-5

-7 ≥-10

As we can see that it follows the given condition because -7 is greater that -10. So the given point (10,-7) is a solution of y ≥-0.5x-5.

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Answer: 402

Step-by-step explanation:

The meaning of the z-score of 2.8 for the past year's temperature is that the temperature is 2.8 standard deviations above the historical mean. Option B is correct

B) The past year's average temperature was 2.8 standard deviations above the historical mean.

The z-score also known as the standard score indicates the relationship of a value, within a set of value, with the mean of the set of values

Mathematically, the z-score can be presented as follows;

[tex]Z = \dfrac{x- \mu}{\sigma}[/tex]

Where;

x = The point score

μ = The mean score

σ = The standard deviation

The z-score indicates the number of standard deviations a score is from the mean

The z-score of the past year's temperature = 2.8

Therefore, the z-score of 2.8 for the past year's temperature indicates that the past year's temperature was 2.8 times the standard deviation away from (above) the mean of the local weather temperature, (the historical mean temperature) on record.

The correct option is option B)

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The required cost of the sweater after sales tax is $31.96.

Given that,
Suzanne bought a sweater priced at $34 and the sales tax is 6%.

The process in mathematics to operate and interpret the function to make the function or expression simple or more understandable is called simplifying and the process is called simplification.

here,
While calculating the percentage it must be multiplied the number with the given percentage value.

Sale tax on sweater = 6% of 34

                              = 0.06 × 34
                              = $2.04

Thus, the required cost of the sweater after sales tax is $31.96.

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