5 out of 7 students in my class are car riders, the rest are bus riders. If 12 students in my class are bus riders, how students are there IN ALL?
9, 7, 21, 4​

Answer:

19

Step-by-step explanation:

Substitute x = -4/5 and solve for b.

5x² + bx + 12 = 0

5(-4/5)² + b(-4/5) + 12 = 0

16/5 − 4/5 b + 12 = 0

16 − 4b + 60 = 0

4b = 76

b = 19

Answer:

Step-by-step explanation:

Rounded answers In Your calculations to find missing measures is given below.

Given: a = 8.72, b = 11.1, c = 11.7

Using the Law of Cosines, we can calculate angle A:

A = arccos((b2 + c2 - a2)/2bc)
A = arccos((11.12 + 11.72 - 8.722)/(2*11.1*11.7))
A = arccos(2.61/265.57)
A = arccos(0.00984)
A = 89.8°

Using the Law of Sines, we can calculate angle B:


Using the Law of Cosines, we can calculate side c:

c2 = a2 + b2 - 2abcos(C)
c2 = 8.722 + 11.12

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Answer:

24

Step-by-step explanation:

Let the number of members they visit last week be x.

Then, they visit x/4 + 10 this week

x/4 + 10 = 16

x = 4 x 6

x = 24

Pls mark as brainliest if possible. Don't know why i need it, but i do. Cheers

The general form of a linear Equation in two variables is ax + by + c = 0.

32-y=1

0.x+y+32 = 0

Hence Proved.

Big boxes have 1/4 of 20 gigabytes of ram will be 5 gigabytes.

Algebra is the study of abstract symbols, while logic is the manipulation of all those ideas.

The acronym PEMDAS stands for Parenthesis, Exponent, Multiplication, Division, Addition, and Subtraction. This approach is used to answer the problem correctly and completely.

Big boxes have 1/4 of 20 gigabytes of ram.

Then the multiplication of the numbers 1/4 and 20 will be given by putting a cross sign between them. Then we have

⇒ (1/4) x 20

⇒ 20 / 4

⇒ 5 gigabytes

Big boxes have 1/4 of 20 gigabytes of ram will be 5 gigabytes.

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The slope of the curve at a point (x,y) is given as 3y. This means that the equation of the curve is in the form of y = mx + b, where m is the slope of the curve and b is the y-intercept.

Since the curve passes through the point (4,2), we can use this point to find the value of b:

y = mx + b

2 = 3(4) + b

b = -10

So the curve's equation is: y = 3x - 10

You can confirm this by plugging in the point (4,2) into the equation.

2 = 3(4) - 10

2 = 12 - 10

2 = 2

The roast needs to sit 116 minutes before it is ready to be eaten.

Let T(t) = temperature after t minutes

By Newton's Law of Cooling, T(t) = 75 + (185-75)e^kt = 75 + 110e^kt

Newton's law of cooling states that the rate of change of temperature of an object is directly proportional to the difference in temperature between the object and its surroundings. Mathematically, it can be expressed as:

dT/dt = k(T - T0)

Where:

dT/dt is the rate of change of temperature (in degrees per time unit, such as degrees per second)

k is the cooling constant (in units of 1/time), which is a measure of how quickly an object cools down and depends on the properties of the object and its surroundings

T is the current temperature of the object (in degrees)

(a). T(30) = 75 + 110e^30k = 150

⇒110e^30k = 75

⇒e^30k = 0.681818

⇒30k = ln(0.681818)

⇒k = -0.0127664

We know, T(t) = 75 + 110e^-0.0127664t

  So, T(45) = 75 + 110e^-0.0127664(45) ≈ 137°

(b).  T(t) = 100 when 75 + 110e^-0.0127664t = 100

⇒ e^-0.0127664t = 0.2272727

⇒-0.0127664t = ln(0.2272727)

 ⇒t ≈ 116 minutes

Therefore, The roast needs to sit 116 minutes before it is ready to be eaten.

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Answer: C. [tex]2.8[/tex]

Step-by-step explanation:

Using the distance formula, [tex]\sqrt{(-1-1)^2 +(-1-1)^2} \approx 2.8[/tex].

Answer:

Step-by-step explanation:

The right answer involves doing both studies with the identical data set, drawing conclusions regarding means, and using a two-sided significance test.

An algorithm which it sets two ratios to the same value is called a fraction. You might, for instance, write its ratio as follows: 1: 3 in the case of 1 male & Three girls (for every one boy there are 3 girls) There are 3 out of 4 females and 1 out of 4 guys. 0,25 are men (by dividing 1 by 4)

A ratio that connects a part to yet another is a percentage. For instance, there are 100 students in the class containing 20 men or 80 women. The percentage of males is 20/100, or 20%. 80 out of 100, or 80%, are women.

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you can choose my starting team in equation of 7 x 6 x 5 x 4 x 3 x 2 x 1 = 7 x 5 x 4 x 3 x 2 = 2520 ways.

7 x 6 (choose 7 players from 15) x 5 x 4 x 3 x 2 x 1 (7 players in any order) = 7 x 5 x 4 x 3 x 2 (7 players in any order, ignoring the goalie)

= 2520 ways.

In order to figure out how many ways I can choose my starting team, I can use a combination equation. Start by taking the number of players (15) and subtracting the number of players I need for the starting team (7). This gives me 8 players who will not be chosen. Now, I can calculate the number of ways I can choose the 7 players from the 15 available players. This is equal to 15 x 14 x 13 x 12 x 11 x 10 x 9. This is the same as 7 x 6. Now, I need to account for the order in which I choose the players. Since the 6 players other than the goalie can be interchangeable, I can use the equation 7 x 6 x 5 x 4 x 3 x 2 x 1. This gives me 2520 ways to choose my starting team. To simplify this, I can factor out the 7 and the 1, leaving me with 7 x 5 x 4 x 3 x 2, which is still equal to 2520. Therefore, I can choose my starting team in 2520 ways.

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Answer:

3 cm

Step-by-step explanation:

The formula of a cylinder is given by:

[tex]\pi r^{2} h[/tex]

where r is the radius and h is the height of the cylinder.

Given information from the question:

Volume of cylinder = [tex]90cm^{3}[/tex]

Radius of cylinder = 3cm

We can derive an equation to find the height:

[tex]90=\pi 3^{2} h\\9\pi h=90\\h = \frac{90}{9\pi } \\h = 3.18cm[/tex]

Given the height is 3.18cm, we will choose the closest answer which is 3 cm.

Answer:

80

Step-by-step explanation:

96-16

A 1-factor graph is a graph that can be decomposed into one or more 1-factors. In other words, a 1-factor graph is a graph that can be partitioned into disjoint perfect matchings.

In graph theory, a 1-factor is a subgraph of a graph that forms a perfect matching, or 1-factorization. A perfect matching is a set of edges in a graph such that each vertex is incident to exactly one edge in the set. A 1-factorization of a graph is a collection of perfect matchings such that every vertex is included in exactly one perfect matching.

The study of 1-factors and 1-factorizations is an important area of graph theory because of its connections to other areas of mathematics such as algebra, combinatorics, and statistical physics. It has various applications including coding theory, scheduling, and transportation networks.

1-factor graph theory is the study of graphs that can be decomposed into 1-factors and the properties of such graphs. This field of study helps to understand the conditions under which a graph can be decomposed into 1-factors and the properties of such graphs.

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Answer:

13.4 dollars

Step-by-step explanation:

13.4 dollars is how much kelly deposit

Answer: n = -16

Step-by-step explanation:

1) Distribute

—2(3n +6) = 3(-n + 12)

—6n - 12 =3(-n + 12)

2) Distribute

—6n - 12 = 3(-n + 12)

—6n — 12 = —3n +36

3) Add 12 to both sides

—6n — 12 = -3n +36

-6n = 12+ 12 = - 3n + 36 + 12

4) Simplify

----Add the numbers

—6n = -3n +48

5) Add 3n to both sides

—6n = -3n +48

—6n + 3n = —3n + 48 + 3n

6) Simplify

- Combine like terms

—3n = 48

7) Divide both sides by the same factor

—3n = 48

-3n ÷ -3 = 48 ÷ -3

8) Simplify

- Cancel terms that are in both the numerator and denominator

- Divide the numbers

n = —16

Please give brainliest

Answer:

We can start solving this problem by finding the two numbers that bound the range of integers we're looking for.

First, we can approximate $\sqrt{5}$ to the nearest integer by finding the square root of 5. We know that 2^2 = 4 and 3^2 = 9, so 2 < $\sqrt{5}$ < 3. Therefore, $\sqrt{5}$ is a little bit more than 2 and a little bit less than 3.

Therefore, there are 6 integers that fall between $\sqrt{5}$ and $\sqrt{50}$ on a number line.

Step-by-step explanation:

Similarly, we can approximate $\sqrt{50}$ to the nearest integer by finding the square root of 50. We know that 7^2 = 49 and 8^2 = 64, so 7 < $\sqrt{50}$ < 8. Therefore, $\sqrt{50}$ is a little bit more than 7 and a little bit less than 8.

Now we know that the range of integers we are looking for is between 2 and 7, inclusive. There are 7-2+1 = 6 integers between 2 and 7: 2, 3, 4, 5, 6, 7.

Therefore, there are 6 integers that fall between $\sqrt{5}$ and $\sqrt{50}$ on a number line.

Answer:

k - 2n = x

Step-by-step explanation:

4^n = 2 ^ 2n

2^k/2^2n = 2^(k-2n) = 2^x

k - 2n = x

Thanks

Answer:

x = k - 2n

Step-by-step explanation:

The main exponent properties

[tex]a^{m}[/tex] × [tex]a^{n}[/tex] = [tex]a^{m+n}[/tex]         ........ (1)

[tex]\frac{a^{m} }{a^{n} }[/tex] = [tex]a^{m}[/tex] ÷ [tex]a^{n}[/tex] = [tex]a^{m-n}[/tex] ........ (2)

[tex](a^{m} )^{n}[/tex] = [tex]a^{m*n}[/tex] = [tex]a^{mn}[/tex]   ........ (3)

~~~~~~~~~~~~~~~~~~

[tex]\frac{2^{k} }{4^{n} }[/tex] = [tex]2^{x}[/tex]

Let apply (3) and (2) exponent properties

L.H. = [tex]\frac{2^{k} }{(2^2 )^{n} }[/tex] = [tex]\frac{2^{k} }{2^{2n} }[/tex] = [tex]2^{k-2n}[/tex]

[tex]2^{k-2n}[/tex] = [tex]2^{x}[/tex]  ⇒  x = k - 2n

The provided statement indicates that the differential equation's solution will be y = c₁ + c₂ e⁻ˣ - 1/2 cos x

Equations with General Differential. Consider the differential equation y′=3x2, which has a derivative and is an illustration of a differential equation. The variable x and y are related because y is an unidentified function of x. The component of y is also on the equation's left-hand side.

The analytical solution is, given that.

⇒ y'' + y = sin x

Now,

The system of equations as follows:

The difference between these two is,

⇒ y'' + y = sin x

Find its auxiliary equation as;

⇒ m² + m = 0

⇒ m (m + 1) = 0

⇒ m = 0 or m = - 1

Therefore, the auxiliary equation is c1 e0 + c2 ex.

                                     = c₁ + c₂ e⁻ˣ

And, Particular integral = 1/(D² + D) (sin x)

                                  = 1/2D (sin x)

                                  = 1/2 (- cos x)

                                  = - 1/2 cos x

Consequently, the differential equation's solution will be;

⇒ y = A.E + P.I

⇒ y = c1 + c2 e x - cos x / 2

As a result, the differential equation's solution is;

⇒ y = c1 + c2 e x - cos x / 2

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The complete question is-

Solve the differential equation by variation of parameters.

y'' + y = sin x

On solving the provided question, we can say that equation of cost of the roller blades is $ 89.66

An equation is a mathematical formula that connects two assertions using the equal sign (=) to denote equivalence. In algebra, an equation is a mathematical statement that establishes the equivalence of two mathematical expressions. For instance, an equal sign separates the components 3x + 5 and 14 in the equation 3x + 5 = 14. A mathematical formula is used to explain the connection between two sentences on either side of a letter. Frequently, there is just one variable, which is also the symbol. for example, 2x - 4 = 2.

Let the total cost = A

initial cost = $ 129.50

he discount percentage = 40 %

So , the equation will be

= 129.50 - ( 40/100 ) x 129.50

= 129.50 - 51.8

= $ 77.7

sales tax percentage = 15 %

So , the equation will be

= 77.7 + ( 15/100 ) x 77.7

 = 77.7 + 11.655

= $ 89.655

final cost is A = $ 89.66

final cost of the roller blades is $ 89.66

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The volume of the pentagonal right pyramid with base area 30 square metres and height 5 metre is 50 m³.

Therefore the answer is 50 m³.

To find the volume of a pentagonal pyramid, we can use the formula:

V = (Bh)/3

where V is the volume, B is the area of the base and h is the height.

Area of the base is given, B = 30 m². From figure it is evident that the height of the pentagonal right pyramid is 5m. Therefore the volume of the figure is

V = 30 × 5/ 3

V = 50 m³

--The question is incomplete, answering to the question below--

"This pentagonal right pyramid has a base area of 30 m². What is the volume of the figure?"

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Answer: The cosine of angle C is -0.0168.

Step-by-step explanation: To find the cosine of the angle opposite the side of length 2.92 meters, you can use the cosine law which states that:

c^2 = a^2 + b^2 - 2ab * cos(C)

where c is the length of the hypotenuse (the longest side), a and b are the lengths of the other two sides, and C is the angle opposite side c.

So in this case,

c = 8.82 m

a = 2.92 m

b = 7.67 m

then we can substitute the values into the equation and solve for cos(C):

(8.82)^2 = (2.92)^2 + (7.67)^2 - 2(2.92)(7.67) * cos(C)

cos(C) = (a^2 + b^2 - c^2) / (-2ab)

cos(C) = (2.92^2 + 7.67^2 - 8.82^2) / (-22.927.67)

cos(C) = -0.0168

The function that includes the data-set {(2,4), (6,6) (12,9)} is given as follows:

D. y = x/2 + 3.

The points of the data-set follow the format given as follows:

(x,y).

Hence the meaning of each point is given as follows:

Then the correct option is given by option D, that is:

y = x/2 + 3.

As we obtain the numeric values of y for the input x as follows:

Which are the three points that compose the data-set.

The options are given by the image presented at the end of the answer.

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The cost of credit, in dollars, for this loan is 299.6107 dollars.

Let's recall the total cost of the computer with tax C. Then,

C = 1999.99 + 0.07 × 1999.99 = 1999.99 + 139.9993 = 2139.9893.

Since the loan allows you to pay for the computer in 12 equal payments of $203.30, the total cost of the loan is 12 × 203.30 = 2439.60.

The cost of credit is then the difference between the total cost of the computer with tax and the total cost of the loan: 2439.60 - 2139.9893 = 299.6107.

So the cost of credit is 299.6103 dollars.

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Answer:

$1.44

Step-by-step explanation:

9kg costs $12.96

1kg costs ($12.96*1kg)÷9kg

=$1.44

Answer:

Step-by-step explanation:

[tex] \: \: \: \: \: \: \: \: \: \huge \color{green}{ \fbox \colorbox{black}{ \fbox{ \green {Answer} \: }}}[/tex]

[tex] \longrightarrow \sf \color{teal}{ \cos {}^{2} (x) + 2 \cos(x) + 1} = 0[/tex]

[tex] \longrightarrow \sf \color{teal}{ \cos {}^{2} (x) + \cos(x) + \cos(x) + 1} = 0[/tex]

[tex] \longrightarrow \sf \color{teal}{ \cos {}^{} (x) ( \cos(x) + 1)+ 1(\cos(x) + 1} )= 0[/tex]

[tex] \longrightarrow \sf \color{teal}{ ( \cos(x) + 1)(\cos(x) + 1} )= 0[/tex]

[tex] \longrightarrow \sf \color{teal}{ ( (\cos(x) + 1} {}^{} ) {}^{2} = 0[/tex]

[tex] \longrightarrow \sf \color{teal}{ ( (\cos(x) + 1} {}^{} ) {}^{} = 0[/tex]

[tex] \longrightarrow \sf \color{teal}{ \cos(x) {}^{} }= - 1[/tex]

[tex]\longrightarrow \sf \color{teal}{ x{}^{} }= \cos {}^{ - 1}( - 1)[/tex]

[tex]\longrightarrow \sf \color{teal}{ x = (2n + 1) \pi \: \: \: \: rad}[/tex]

where, [tex]{ n \in \{whole \:\; number\}} [/tex]

Principle value -

[tex] \longrightarrow \sf \color{teal}{ x} {}^{} {}^{} = \cos {}^{ - 1} ( - 1) [/tex]

[tex] \longrightarrow \sf \color{teal}{ x} {}^{} {}^{} = (2n + 1) \pi \: \: \: \: rad \: [/tex]

put n = 0

[tex] \longrightarrow \sf \color{teal}{ x} {}^{} {}^{} = (2(0) + 1) \pi \: \: \: \: rad \: [/tex]

[tex] \longrightarrow \sf \color{teal}{ x} {}^{} {}^{} = (0 + 1) \pi \: \: \: \: rad \: [/tex]

[tex] \longrightarrow \sf \color{teal}{ x} {}^{} {}^{} = \pi \: \: \: \: rad \: = 180 \degree[/tex]

Therefore ,2.113 is the deemed appropriate of the greatest square that could be inscribed with in area between the square and the triangle.

A triangle is considered a polygon since it has four vertices or segments. It is a basic geometric form. Triangle ABC refers to a triangle the with ends A, B, and C. In Euclidean geometry, a singular plane plus square are produced when the sides are not collinear. A triangle is a polygon if it has three parts and three corners. The points where the three sides of the triangle meet are known as its corners. Three triangle angles add up to 180 degrees.

Here,

The midpoint of foot FE, G, is where we start by measuring the side length of the equilateral triangle.

Given that DE=GB and G is the midpoint, let GE equal x.

As a result, DGGB=x3 using fundamental trigonometry.

DB=2x3 follows.

We may then construct the equation 2x3=102 because DB is the orthogonal of ABCD and has length 102. Thus, the triangle's side length is

2x=(10√2)/√3.

Now, observe the diagonal AC. It is composed of the triangle's side length and the little square's diagonal multiplied by two. Let the little square's side length be y:

Let the little square's side length be y:

AC=y√2 + [(10√2)/√3]+y√2=10√2.

How to find y?

=>y√2+y√2 + (10√2√3)/3=10√2

=>y√2+y√2 + (10√6)/3=10√2

=> [3y√2+3y√2 + (10√6)] /3=10√2

=>6y√2+10√6=30√2

=>6y√2 = 30√2-10√6

=>y√2 = (30√2-10√6)/6

=>y = (30√2-10√6)/6√2

=>y = (60-20√3)/12

=>y= 5(3−√3)3  or 2.113

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Answer: h= 4/5yr+ 5

Step-by-step explanation: by looking at the graph the slope is 4/5 and it intercepts the graph at 5 so y=4/5x + 5, then I plugged in the variables on the graph to get yr for year and h for height

The degrees of freedom for the regression sum of squares in a regression model is determined by the number of variables that are being used to make predictions. For example, if you have three independent variables in your model, the degrees of freedom for the regression sum of squares would be 3.

The degrees of freedom for the error sum of squares is the total number of observations in your dataset, minus the number of independent variables used in the model.

The total sum of squares is the sum of the squared differences between each observation and the overall mean of the variable being predicted. This has the same number of degree of freedom as the error sum of squares, which is total number of observations -1.

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126 number of ways we can arrange the men, women in order to committee with 2 women and 2 men ,the combination is explained below as

We can use the combination formula to find  out the number of ways to choose 2 women and 2 men from a group of 4 women and 5 men.

as we know the  formula for combination as :

C(n ,k) = n! / (k!(n-k)!)

where n is the total number of people, k is the number of people we want to choose, and ! denotes factorial to find the number of combinations  (i.e. the product of all integers up to that number, e.g. 4! = 432*1 = 24).

In this case,  to choose the number of individuals as = 4 + 5 = 9 and k = 2 + 2 = 4. So, the number of ways to choose the committee is:

C(9,4) = 9! / (4!(9-4)!) = 126 ways

Hence the number of ways to choose committee is 126 ways.

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