Michael got a $50 gift card to an online music store. She uses the gift card to buy an album for $9.99. She also wants to use the gift card to buy some songs. Each song costs $1.29. Which of these inequalities describes this situation, where n is the number of songs Michael wants to buy?

It looks like the integral is

\(\displaystyle 6 \int yz\cos(x) \, ds\)

With \(x=t\), \(y=\cos(t)\), and \(z=\sin(t)\), the line element is

\(ds = \sqrt{\left(\dfrac{dx}{dt}\right)^2 + \left(\dfrac{dy}{dt}\right)^2 + \left(\dfrac{dz}{dt}\right)^2} \, dt = \sqrt2 \, dt\)

and so

\(\displaystyle 6 \int yz\cos(x) \, ds = 6\sqrt2 \int_0^\pi \cos^2(t) \sin(t) \, dt\)

Substitute \(u = \cos(t)\) and \(du=-\sin(t)\,dt\), then

\(\displaystyle 6 \int yz\cos(x) \, ds = -6\sqrt2 \int_1^{-1} u^2 \, du = 12\sqrt2 \int_0^1 u^2 \, du = \boxed{4\sqrt2}\)

where in the second-to-last equality, we have

\(\displaystyle -\int_1^{-1} = \int_{-1}^1\)

and

\(\displaystyle \int_{-1}^1 u^2 \, du = 2 \int_0^1 u^2\,du\)

by symmetry.

Answer: 8

Step-by-step explanation:

Answer:

A, C, D

Step-by-step explanation:

Given, the function is f(x,y,z)=5+yxz+g(x,z)Here, we need to find the directional derivative of f at the point (3,0,3) along the direction of the vector (0,4,0) . The directional derivative of f at the point (3,0,3) along the direction of the vector (0,4,0) is 0.

Using the formula of the directional derivative, the directional derivative of f at the point (3,0,3) along the direction of the vector (0,4,0) is given by

(f(x,y,z)) = grad(f(x,y,z)).v

where grad(f(x,y,z)) is the gradient of the function f(x,y,z) and v is the direction vector.

∴ grad(f(x,y,z)) = (fx, fy, fz)

                       = (∂f/∂x, ∂f/∂y, ∂f/∂z)

Hence, fx = ∂f/∂x = 0 + yzg′(x,z)fy

                = ∂f/∂y

                = xz and

fz = ∂f/∂z = yx + g′(x,z)

We need to evaluate the gradient at the point (3,0,3), then

we have:fx(3,0,3) = yzg′(3,3)fy(3,0,3)

                             = 3(0) = 0fz(3,0,3)

                             = 0 + g′(3,3)

                             = g′(3,3)

Therefore, grad(f(x,y,z))(3,0,3) = (0, 0, g′(3,3))Dv(f(x,y,z))(3,0,3)

                                                 = grad(f(x,y,z))(3,0,3)⋅v

where, v = (0,4,0)Thus, Dv(f(x,y,z))(3,0,3) = (0, 0, g′(3,3))⋅(0,4,0)   = 0

The directional derivative of f at the point (3,0,3) along the direction of the vector (0,4,0) is 0.

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The total number of visitors to the zoo that day=3980.

Given:

cost of each ticket for an adult=$25

cost of each ticket for an adult=$10

Total ticket sales one day=$47,750.

⇒$25+$10=47,750

⇒25+10=47,750-----(1)

Also,

c=6a+270

6a-c=-270------(2)

multiplying eq(2) with 10 we get:

60a-10c=-2700----(3)

Adding eq(1) and eq(3) we get

25a+10c=47,750

60a-10c=-2700

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

85a=45050

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

To calculate a value just divide 45050 by 85 we get

a=45050/85

a=530

Now to get the value of c substitutes a value.

c=60(530)+270

c=3450

Number of Adult visitors=530

Number of children visitors=3450

Total Number of visitors=3980.

Therefore, the total number of visitors to the zoo that day=3980.

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The proof shows that if the premises (x > 1), a = 1, y = x, y = y – a, (y >\(0 ^ x\) > y) are true, then the conclusion (x > 1) a = 1; y = x; y = y – a; (y > \(0 ^ x\) > y) is also true. The proof also shows the logical relationship between the premises and the conclusion.

To prove that ⊢ (x > 1) a = 1; y = x; y = y – a; (y >\(0 ^ x\) > y), we need to show that the given statement is a valid formula using the axioms of propositional logic and the rules of inference.

Firstly, let's understand the given statement.

(x > 1) a = 1;

y = x;

y = y – a;

(y > 0 ^ x > y)

Here,
(x > 1) is a premise which states that x is greater than 1.
a = 1 is a statement that sets the value of a as 1.
y = x sets the value of y as x.
y = y – a subtracts the value of a from y and updates the value of y.
(y > \(0 ^ x\) > y) is a conjunction of two predicates which states that y is greater than 0 and x is greater than y.

Now, let's use the rules of inference to prove that the given statement is a valid formula.

Proof:
1. (x > 1) (Premise)
2. a = 1 (Premise)
3. y = x (Premise)
4. y = y - a (Premise)
5. y > 0 (Premise)
6. x > y (Premise)
7. y - a > 0 (Subtraction, 5, 2)
8. x > y - a (Substitution, 6, 2, 4)
9. y > a (Subtraction, 3, 2)
10. y > \(0 ^ y\) > a (Conjunction, 5, 9)
11. y > \(0 ^ y\) - a > 0 (Conjunction, 7, 9)
12. y > \(0 ^ x\) > y (Conjunction, 8, 10)
13. (x > 1)

a = 1;

y = x;

y = y – a;

(y > 0 ^ x > y)

Therefore, we have proved that the given statement is a valid formula using the rules of inference and axioms of propositional logic.

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The area under the curve y = x² + 5/7x - x² from 1 to 6 is equal to 25 square units.

To find the area of the region under the given curve from 1 to 6, we need to integrate the function y = x² + 5/7x - x² with respect to x over the interval [1, 6].
First, we need to simplify the function by combining like terms:
y = x² + 5/7x - x²
y = 5/7x
Now, we can integrate the function over the interval [1, 6]:
∫[1, 6] (5/7x) dx = (5/7) * ∫[1, 6] x dx
= (5/7) * [x^2/2] from 1 to 6
= (5/7) * (36/2 - 1/2)
= (5/7) * (35)
= 25

Therefore, the area of the region under the given curve from 1 to 6 is 25 square units.

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Answer: (x + 3)^2 + (y - 4)^2 = 49

Step-by-step explanation:

The equation of a circle given the center and radius: (x - h)^2 + (y - k)^2 = r^2

Given: center (-3,4) ; h = -3 and k = 4

diameter = 14

To find the radius: divide the diameter by 2 = 14/2 = 7 = r

Center: (-3,4) and radius: 7

Equation of a circle: (x - h)^2 + (y - k) ^2 = r^2

Substitute h = -3, k = 4, r = 7

(x - (-3))^2 + (y - 4)^2 = 7^2

Answer:

Equation of the circle: (x + 3)^2 + (y - 4)^2 = 49

The theoretical domain is all real numbers greater than or equal to one and less than or equal to two. Then the correct option is C.

Inequality is simply a type of equation that does not have an equal sign in it. Inequality is defined as a statement about the relative size as well as is used to compare two statements.

Kellen runs for at least 1 hour but for no more than 2 hours. He runs at an average rate of 6.6 kilometers per hour. The equation that models the distance he runs for t hours is d = 6.6t

Then the domain of the function d will be a real number.

But in the problem, the value of t is more than or equal to one but less than or equal to two.

1 ≤ t ≤ 2

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The correct answer is B. The graph of h is the graph of g vertically shifted up 1 unit.

The correct answer is:

B. The graph of h is the graph of g vertically shifted up 1 unit.

Explanation:

The original function g(x) = x² represents a basic quadratic function, which is a parabola that opens upward and has its vertex at the origin (0, 0).

When we consider the function h(x) = g(x) + 1, we are adding a constant value of 1 to the output (y) values of the function g(x). This results in a vertical shift of the graph of g(x) by 1 unit upward.

In other words, for every x-value, the corresponding y-value of the function h(x) will be 1 unit higher than the corresponding y-value of the function g(x).

Visually, this means that the graph of h(x) will be the same shape as the graph of g(x), but it will be shifted upward by 1 unit. The vertex of the parabola, which was originally at the origin, will now be at (0, 1).

The statement "The graph of h is the graph of g horizontally shifted left 1 unit" (Option A) is incorrect because there is no horizontal shift in this transformation.

The statement "The graph of h is the graph of g vertically shifted down 1 unit" (Option B) is incorrect because the transformation results in a vertical shift upward, not downward.

The statement "The graph of h is the graph of g horizontally shifted right 1 unit" (Option D) is incorrect because there is no horizontal shift in this transformation.

Therefore, the correct answer is B. The graph of h is the graph of g vertically shifted up 1 unit.

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The predicted population of Tanzania 5.5 years ago is approximately 46.1 million. This estimation is based on the current population, the population growth rate, and the formula for exponential population growth.

To predict the population of Tanzania 5.5 years ago, we need to use the population growth rate and the current population.

The formula for exponential population growth is:

P = P0 * e^(rt)

Where:

P = population after time t

P0 = initial population

r = growth rate (expressed as a decimal)

t = time in years

e = Euler's number (approximately 2.71828)

Given information:

Current population (P0) = 50.3 million

Growth rate (r) = 2.14% per year

Time (t) = -5.5 years (5.5 years ago)

Converting the growth rate to decimal form:

r = 2.14% = 0.0214

Substituting the values into the formula:

P = 50.3 million * e^(0.0214 * -5.5)

Calculating the exponential growth:

P = 50.3 million * e^(-0.1177)

P ≈ 46.1 million

Rounding the answer to one decimal place and expressing it in millions, the predicted population of Tanzania 5.5 years ago is approximately 46.1 million.

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False , the variance and standard deviation are not measures of central location

Given data ,

The variance and standard deviation are not measures of central location but measures of dispersion or spread of a dataset

Measures of central location include the mean, median, and mode, which represent the typical or central value of a dataset

The variance and standard deviation are measures of dispersion or spread in a dataset. They provide information about how the values in a dataset are spread out around the mean.

In order to understand the variability or dispersion of data points within a dataset, one must take into account both the variance and standard deviation. They provide information on the range of values and aid in calculating how far away from the mean certain data points are. In statistics and data analysis, these metrics are frequently used to comprehend and evaluate the variance of various datasets.

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The difference between the actual number of counties in Texas and Zane's rounded number of counties can be found by subtracting Zane's rounded number from the actual number. Let's represent the actual number of counties as "x" and Zane's rounded number as "y". The equation representing the difference is x - y.

Let's assume that the actual number of counties in Texas is "x". Zane rounds the number to the nearest ten, so his rounded number of counties can be represented as "y". The difference between the actual number and Zane's rounded number can be calculated by subtracting Zane's rounded number from the actual number, which gives us the equation x - y. Substituting the given values, where x = 254 (actual number of counties) and y is the rounded number, we can find the difference.

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To disprove Micah's claim that the base of the prism must be a square, we can draw a rectangular base for the prism with dimensions that satisfy the volume and height requirements.

Micah's claim states that the base of the prism must be a square. However, to show that this claim is incorrect, we need to provide a counterexample by drawing a base that is not a square but still satisfies the given conditions.

Given that the volume of the prism is 360 cubic units and the height is 10 units, we can find the dimensions of the base by dividing the volume by the height: 360/10 = 36.

Now, we can draw a rectangle as the base of the prism with dimensions that multiply to give a product of 36. For example, we can draw a base with dimensions of 4 units by 9 units. This rectangle is not a square since its sides have different lengths.

By constructing a rectangular base with dimensions of 4 units by 9 units, we demonstrate that Micah's claim is incorrect. This shows that the base of the prism does not have to be a square, as there are other valid configurations that satisfy the given volume and height requirements.

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Answer: 32%

Step-by-step explanation:

The reason on why this answer is 32% is because in order to calculate joint relative frequency, you must have two values.

The first value is the one the question is asking you about. For this, it's mobile device in online classes, which is 64 on the table. Simply divide this number by the total of the table, which is normally on the bottom right. In this case, it's 200.

Now all that needs to be done is this:

\(\frac{64}{200}\) = 0.32, which is 32%.

The answer is 32%, C.

The joint relative frequency of students who use a mobile device in an online class will be 32% as the "Student who use a mobile device in online class=64 and total students=200".

The ratio of a frequency that is not in the total row or column to the total number of values or observations is known as joint relative frequency. In a two-way frequency table, the marginal frequency is the entry in the "total" for the column and the "total" for the row. These are the frequencies in a given category divided by the total number of data values. The term "joint frequency" refers to the joining of one variable from the row and one variable from the column. The ratio of the frequency in a specific category to the total number of data values is known as joint relative frequency.

Here,

Title                Traditional       Online        Row totals

Computer:        |28|                 |62|              |90|

Mobile device: |46|                  |64|             |110|

Column totals:  |74|                  |126|           |200|

The joint relative frequency of students who use a mobile device in an online class,

Student who use a mobile device in online class=64

Total students=200

64/200=0.32

0.32*100=32%

As "Students who use a mobile device in an online class=64 and total students=200," the joint relative frequency of students who use a mobile device in an online class will be 32%.

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After considering the given data we conclude that there truth table is possible and is placed in the given figures concerning every sub question.

A truth table is a overview that projects  the truth-value of one or more compound propositions for each possible combination of truth-values of the propositions starting up the compound ones.
Every row of the table represents a possible combination of truth-values for the component propositions of the compound, and the count of rows is described by the range of possible combinations.
For instance, if the compound has just two component propositions, it comprises  four possibilities and then four rows to the table. The truth-value of the compound is projected on each row comprising the truth functional operator.
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Answer:  83 + 40\(\sqrt{2}\)

a = 83 and b = \(40\sqrt{2}\)

Step-by-step explanation:

Firstly start by simplifying \(\sqrt{18}\) .

1. \(\sqrt{9 * 2}\)

2. \(3\sqrt{2}\)

Then multiply the parentheses with each other

1. 77 + 7\(\sqrt{2}\) + 33\(\sqrt{2}\) + 6

2. 83 + \(40\sqrt{2}\)

Answer:

£2628.80 (might not be correct, but here me out \o/)

Step-by-step explanation:

16 and overs : 18.60

under 16 : 12.80

155 people and 49 are under 16 right

155 - 49 is 106, this is the amount of 16 and overs bought a ticket

then u do 318.60 x 106 = £1971.60

and  £12.80 x 49 = £657.20

then add £657.20 + £1971.60 and u get £2628.80

p.s: again im not 100% sure if its correct :)

Answer: 5h+4=A

Step-by-step explanation:

She gets five dollars an hour so for one hour she gets five dollars, for two hours she gets 2 times 5 dollars (10 dollars), for three hours she gets 3 times 5 dollars (15 dollars) etc...

Now replace the 1,2,3... with the variable representing the hour. In this case it would be h. So 5h=five dollars per hour. Because you only put the kid to bed once, you add four at the end

Answer:

44

Step-by-step explanation:

Substitute the values for the variables.

5(8) + 12/3

40 + 4 = 44

When checking alignment angles in a vehicle, a technician should look for several factors to ensure proper alignment:

a. All angles within factory specifications: The technician should check if all the alignment angles, including camber, caster, and toe, fall within the specified range provided by the vehicle manufacturer.

b. The camber on the left and right should be within 0.5 degrees of each other: Camber refers to the inward or outward tilt of the wheels when viewed from the front of the vehicle.

c. The caster on the left and right should be within 0.5 degrees of each other: Caster refers to the angle of the steering axis when viewed from the side of the vehicle. It helps provide stability and steering control.

By checking these factors and ensuring they meet the specified criteria, the technician can ensure that the vehicle's alignment is correct, promoting optimal tire wear, handling, and overall performance.

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Answer:

300

Step-by-step explanation:

each ten is worth 10 so 10x30+ 300

plz mark brainliest

Answer:

94.25 or 94

Step-by-step explanation:

I think this question is asking for the circumference .

The length of each loop of rope is about 8 feet when the rope was coiled into circular loops of about 30 inches in diameter.

To find the length of the rope in each circular loop, we need to calculate the circumference of the circle. The circumference is the distance around the circle and can be calculated using the formula:

Circumference = π * Diameter

Diameter = 30 inches

To find the length in feet, we need to convert the inches to feet. Since there are 12 inches in a foot, we divide the diameter by 12:

Diameter in feet = 30 inches / 12 inches/foot = 2.5 feet

Now, we can calculate the circumference:

Circumference = π * Diameter

Circumference = π * 2.5 feet

To find the approximate length in feet, we need to use an approximation for π. Let's assume π ≈ 3.14:

Circumference ≈ 3.14 * 2.5 feet

Circumference ≈ 7.85 feet

To the nearest foot, the length of each loop of rope is about 8 feet.

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The operation that Amjed should perform to determine the relative frequency of a person over 30 years old who prefers to ride a mountain bike is given as follows:

2) Divide 25 by 462.

The parameters that are needed to calculate a probability are listed as follows:

Then the probability is calculated as the division of the number of desired outcomes by the number of total outcomes, hence it is the same as a relative frequency.

The total number of people is given as follows:

58 + 164 + 215 + 25 = 462.

Out of these people, 25 prefer mountain bike, hence the relative frequency is given as follows:

25/462.

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Using the combination formula, C₄,₁ = 4, and substituting p = 1/2, q = 1/2, and C₄,₁ into Cₙ,ₓpˣqⁿ⁻ˣ, we find that Cₙ,ₓpˣqⁿ⁻ˣ = 1/4.



To evaluate Cₙ,ₓpˣqⁿ⁻ˣ, we can use the combination formula and substitute the given values. The combination formula is given by:

Cₙ,ₓ = n! / (x!(n - x)!)

where n! represents the factorial of n.

Given:

n = 4

x = 1

p = 1/2

First, let's calculate q, which is the complement of p:

q = 1 - p

 = 1 - 1/2

 = 1/2

Now, let's substitute the values into the combination formula:

C₄,₁ = 4! / (1!(4 - 1)!)

     = 4! / (1! * 3!)

Calculating the factorials:

4! = 4 * 3 * 2 * 1 = 24

1! = 1

3! = 3 * 2 * 1 = 6

Substituting the factorials back into the formula:

C₄,₁ = 24 / (1 * 6)

     = 4

Now, let's substitute p, q, and C₄,₁ into Cₙ,ₓpˣqⁿ⁻ˣ:

Cₙ,ₓpˣqⁿ⁻ˣ = C₄,₁ * pˣ * q^(n - x)

           = 4 * (1/2)^1 * (1/2)^(4 - 1)

           = 4 * (1/2) * (1/2)^3

           = 4 * 1/2 * 1/8

           = 4/16

           = 1/4

Therefore, Cₙ,ₓpˣqⁿ⁻ˣ evaluates to 1/4.

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Ren will have to wait for approximately 31 years for the money compounded annually and a rate of 2.3% to double it's original investment.

Compound interest is the interest imposed on a loan or deposit amount. It is the most commonly used concept in our daily existence. The compound interest for an amount depends on both Principal and interest gained over periods. This is the main difference between compound and simple interest.

The formula of compound interest is given as

A = P(1 + r/n)^nt

Substituting the values into the equation;

It will take approximately 31 years to double the investment.

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Tyler drank a total of 9 2/21 liters of water altogether.  

Tyler drank a fraction of 9 5/21 liters of water altogether. To find the total amount of water Tyler drank, we need to add the 2 3 liters of water he drank before jogging and the 3 7 liters of water he drank after jogging. To add these fractions, we need to find a common denominator, which is 21.

For the first fraction, we need to multiply both the numerator and denominator by 7 to get 14/21. For the second fraction, we need to multiply both the numerator and denominator by 3 to get 9/21. Now, we can add these two fractions:

14/21 + 9/21 = 23/21

This is an improper fraction, so we can simplify it to a mixed number by dividing the numerator by the denominator:

23 ÷ 21 = 1 remainder 2

So, Tyler drank a total of 9 2/21 liters of water altogether.

Drinking enough water is essential for staying hydrated and healthy, especially during exercise. It is recommended to drink at least 8 cups (64 ounces or 1.9 liters) of water per day, but this can vary depending on factors such as age, gender, weight, and physical activity level. Drinking enough water can help prevent dehydration, regulate body temperature, flush out toxins, and improve overall health and well-being.
 

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