Please help! (Will give a good amount of points)

The values of [tex]D, D_x, D_y[/tex] are, [tex]D = 13, D_x = 8, D_y = 19[/tex].

What is Cramer's rule?

One of the key techniques used to solve an equation system is Cramer's rule. The determinants of matrices are used in this method to derive the values of the system's variables. Thus, the determinant technique is another name for Cramer's rule.

Consider, the given system of equations

-3x + 4y = 4             ...(1)

2x = 7y - 9               ...(2)

equation (2) can be written as,

2x - 7y = -9             ..(3)

Using Cramer's rule, we have to find the determinant of the coefficient matrix

matrix,

D= [tex]\left[\begin{array}{ccc}-3&4\\2&-7\end{array}\right][/tex]  = (-3)(-7) - 8 = 21 - 8 = 13

Secondly, find the determinant of x coefficient matrix,

[tex]D_x[/tex] =  [tex]\left[\begin{array}{ccc}4&4\\-9&-7\end{array}\right][/tex] = (4)(-7) - (4)(-9) = -28 + 36 = 8

Similarly, find the determinant of y coefficient matrix,

[tex]D_y[/tex] = [tex]\left[\begin{array}{ccc}-3&4\\2&-9\\\end{array}\right][/tex] = (-3)(-9) - (4)(2) = 27 - 8 = 19

Hence, values of the determinants are, [tex]D = 13, D_x = 8, D_y = 19[/tex].

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y=35x+350  is the equation to show the total cost of the party (y) based on the number of guests (x) he invites.

Two or more expressions with an Equal sign is called as Equation.

Given,

James is having a birthday party.

It costs $350 to rent the hall plus $35 per person for food

We need to write an equation to show the total cost of the party (y) based on the number of guests (x) he invites.

y=35x+350

Where x represents the number of guests.

350 is a constant value because it is the cost of the hall.

As 35 is the cost per person, 35x

Hence y=35x+350  is the equation to show the total cost of the party (y) based on the number of guests (x) he invites.

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The number of problems Rhea still have to solve is 8

Fractions represent the parts of a whole or collection of objects. A fraction has two parts. The number on the top of the line is called the numerator and the number at the bottom is called denominator. It tells how many equal parts of the whole or collection are taken.

On Monday Rhea solved 12 out of 36 problems. This means she has 36-12 = 24 problems remaining. On Tuesday she solved 2/3 of the remainder, which means she did 2/3×24= 16problems on Tuesday.

Therefore she will have 24- 16= 8problems to complete after Tuesday.

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The simplified point-slope form is y = 2x -12

A simple definition of point-slope form is a line equation written with only one point on the line and the slope of the line. (x, y) is the point form, and the slope is the rise over run or the ratio of the change in y values to the change in x values.

Given points (2,-8) and (-1,4)

We have to determine the answer in point-slope form

The slope formula provides the slope of the line:

m = (y2 -y1)/(x2 -x1)

m = (4 -(-8))/(-1-2) = 12/-3 = -4

the point-slope formula is given by

y-y1 = m(x-x1)

In terms of this formula:

m = 2

y1 = -8

x1 = 2

Let's simplify by plugging these values into the point-slope formula:

y - y1 = m (x - x1)

y - (-8) = (2)(x - 2)

y + 8 = 2(x - 2)

y + 8 = 2x -4

y = 2x -12

Therefore the simplified point-slope form is y = 2x -12

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The balance is $12989.90.

From the question, we have

[tex]A= P\times \frac{\left ( 1+\frac{APR}{n} \right )^{nt}-1}{\frac{APR}{n}}[/tex]

where,

A is the balance after t years,

P is the periodic payment,

APR is the annual percentage rate,

n is the number of periodic payments per year, and t is the number of years.

[tex]A=250\times \frac{\left ( 1+\frac{0.04}{12} \right )^{12\times 4}-1}{\frac{0.04}{12}}[/tex]

=$12989.90

The balance is $12989.90.

Multiplication:

Finding the product of two or more numbers in mathematics is done by multiplying the numbers. It is one of the fundamental operations in mathematics that we perform on a daily basis. Multiplication tables are the main use that is obvious. In mathematics, the repeated addition of one number in relation to another is represented by the multiplication of two numbers. These figures can be fractions, integers, whole numbers, natural numbers, etc. When m is multiplied by n, either m is added to itself 'n' times or the other way around.

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The joint relative frequency of students who use a mobile device in an online class is approximately 32%.

The joint relative frequency of students who use a mobile device in an online class, we need to divide the frequency of the intersection of the "Mobile device" and "Online" categories by the total number of students (200 in this case) and express it as a percentage.

From the given two-way frequency table, we can see that the frequency for the intersection of "Mobile device" and "Online" is 64.

The joint relative frequency can be calculated as:

Joint Relative Frequency = (Frequency of intersection / Total number of students) × 100

Joint Relative Frequency = (64 / 200) × 100

Joint Relative Frequency ≈ 32%

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Answer:

Nick

Step-by-step explanation:

Nick: 39 miles / 2 hours = 19.5 miles per hour

Jane: 34 miles / 5 hours = 6.8 miles per hour

Nick is biking faster!

Answer:

3720 kg

Step-by-step explanation:

one bag of coffee weighs=0.62 kg

total no. of coffee bags= 240×25=600

total weight of coffee=6000×0.62= 3720

Answer:

ez hi

Step-by-step explanation:

ez

The equation of the circle is x² + y² - 41 =0.

A circle is a round-shaped 2-dimensional geometrical figure in which the points on the boundary are equidistant from a fixed point called a center.

Given, a circle centered at O(0,0)and has a point B (4,5) on its circumference.

The radius of the circle is the distance between the points O(0,0) and B (4,5), therefore,

r = √((4-0)² + (5-0)²)

r = √(16+25)

r = √41

The equation of a circle, centered at the origin with a radius of r =√41  units, is given by,

x² + y² = √41²

x² + y² = 41

x² + y² - 41 =0

Hence, the equation of the circle is x² + y² - 41 =0.

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Answer:

The slope of the line is 1/2.

The y-intercept of the line is 5.

The x-intercept of the line is 10.

Step-by-step explanation:

The y-intercept is where the line intercepts the y axis. (vertical line)

The x-intercept is where the line intercepts the x axis. (horizontal line)

The slope (rise over one) is a bit more complicated to find. First, pick two points on the line and determine their coordinates. Then, determine the difference in y-coordinates of these two points (rise). After that, determine the difference in x-coordinates for these two points (run). Then you have your slope!

Simplifying the expression (x)(6 + x)−2x gives x^2 + 4x

Information given in the question

the expression (x)(6 + x)−2x

The expression is simplified by first expanding

(x) (6 + x) − 2x

6x + x^2 - 2x

x^2 + 4x (products as powers when possible)

The result here is a quadratic equation without the constant variable. it can be simplified further to give

x(x + 4)

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Answer:

First by using inverse operations, subtract 12 on both sides.

Now it will become

Now divide 6 to isolate x

Hence, the answer is

Answer: D. 5.38 > 5.271 > 5.217

The equation of the inverse function is f⁻¹(x) = x/7 - 3/7

The function f(x) is given as

f(x) = 7x + 3

As a general rule, we start by writing f(x) as a variable (say f(x) = y).

So, the equation of the function becomes

y = 7x + 3

The next step is to switch/swap the positions of x and y in the above equation y = x + 5

The equation becomes

x = 7y + 3

The next step is to make y the subject of the formula in the above equation

The equation becomes

y = x/7 - 3/7

Express as an inverse function

f⁻¹(x) = x/7 - 3/7

Hence, the inverse is f⁻¹(x) = x/7 - 3/7

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The startup company needs to sell 68 skateboards in order to break even

To solve this problem, we have to find the profit of the company and what is required to break-even from total sales.

C(x) = 10x + 500

r(x) = -x² + 70x

Profit = revenue - cost

profit = (-x² + 70x) - 10x + 500

profit = -x² + 70x - 10x + 500

profit = -x² + 60x + 500

Solving the quadratic equation

x = 67.4 ≅68

For the startup to break even, they need to sell at least 68 skateboard.

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Answer:

[tex]w=\frac{y+1}{a+2}[/tex]

Step-by-step explanation:

[tex]y-aw=2w-1 \\ \\ y+1=2w+aw \\ \\ y+1=w(a+2) \\ \\ w=\frac{y+1}{a+2}[/tex]

Answer: m/2 + 25 or (0.5)m + 25

Step-by-step explanation:

Answer: (-2, -2)

Step-by-step explanation:

Right now, the coordinates of point C are (1, -3).

It is first moved 3 units to the left, so the point C would change to (1 - 3, -3) = (-2, -3)

It is then moved 2 units up, so point C would change to (-2, -3 + 2) = (-2, -1)

Answer: About 20.25 or [tex]\sqrt{410}[/tex]

Step-by-step explanation:

a²+b²=c²

c is the hypotenuse in this equation, so we can substitute the given side lengths for a and b.

7²+19²=c²

49+361=c²

410=c²

Then we take the square root to get

about 20.25 or [tex]\sqrt{410}[/tex] to be exact

Answer:

Step-by-step explanation:

a² + b². =. c²

7² + 19². =. c²

49 + 361 (400). =. c²

. c = √400= 20cm

Answer:

B.) 1/(x+3)(x+5)

Step-by-step explanation:

Look for the x-intercepts and asymptotes on the graph to get the numerator and denominator

There are no x-intercepts, so the numerator is an integer

The asymptotes are -3 and -5, so the denominator would be (x+3)(x+5) since if you were to set that = to 0 you would get -3 and -5.

Answer: bro You need To add more about the question

Step-by-step explanation:

Answer:

x = 17

y = 2

Length of DF = 20

Step-by-step explanation:

Step 1: Solve x - 3

Step 2: Plug x = 17 into x - 7 and solve

Step 3: Find the length of DF

The size of the bacterial population after 80 minutes is  19048.81

The size of the bacterial population after 7 hours is  49152000.

Given,

A bacterial culture initially contains 3000 bacteria and doubles every half hour.

we are asked to determine the size of the bacterial population after 80 minutes.

The exponential growth law for this problem is

p(t) = 3000 (2)^t/30

where t is the time in minutes. To find the population after 80 minutes, plug in t=80 and evaluate P(80).

p(80) = 3000 (2)^80/30

p(80) = 3000(2)^8/3

p(80) = 19048.81

now, we are asked to determine the size of the bacterial population after 7 hours.

To find it after  hours, plug in t=420 minutes (since 7 hrs equals 420 minutes) and evaluate p(420).

p(420) = 3000(2)^420/30

p(420) = 3000(2)^14

p(420) = 49152000

hence we get the required size of the population.

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a) The expected value of each $1 bet in roulette is of: -$0.988.

b) The interpretation is given as follows: Over time, you should expect to lose about 999 cents for every dollar you bet.

The expected value of a discrete distribution is obtained as the sum of each outcome multiplied by it's respective probability.

The three-number bet is when one sequence of three numbers has to be correctly chosen, hence the probability of winning is of:

p = 1/(10³) = 1/1000.

(as there is only one correct sequence, and for each number, there are 10 outcomes).

The payout is given as follows:

11:1.

That is, if you win, you earn 11 times the amount you bet.

Considering a bet of $1, the distribution of earnings is given as follows:

Hence the expected value of the bet is:

E(X) = 11/1000 - 999/1000 = -$0.988.

Which is the amount you are expected to lose for every dollar you bet.

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The sum of n terms of geometric sequence with n=5, a₁ =4, r=3 is given by = 484.

Given that the sequence is geometric.

First term is = a₁ = 4

Common ratio is = r = 3

The number of terms for which the sum to be determined = n = 5

So the required sum of n terms of given geometric sequence is given by,

S [tex]=a_1\times\frac{r^n-1}{r-1}[/tex]

S [tex]=4\times\frac{3^5-1}{3-1}[/tex]

S = 4*((243-1)/2)

S = (4*242)/2

S = 484

Hence the sum of the given geometric sequence is 484.

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Answer:

????? you did not show the net of the prism

Step-by-step explanation:

Answer:

b) it's a polyhedron

I don't know what else to say

Answer:false

Step-by-step explanation:

Equation of line c parallel to line d and passing through points  (2, -6) is

The equation of line d will be written in the slope intercept form of the form just like line c,

the slope intercept form is as below

y = mx + c

where

m = slope

c = intercept

x = input variables

y = output variables

y = -5x + 3

slope

m = -5

slope of parallel lines are equal hence slope of line d = -5

using the formula for the slope intercept the equation is written

(y - y₁) = m (x - x₁)

point (2, -6) and m = -5

(y - -6) = -5 (x - 2)

y + 6 = -5x + 10

y = -5x + 4

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