Algebra 2 Questions that i need help with

X = [tex](A - CB)^-^1[/tex]CD is the required matrix solution of the equation  [tex]AX(D+BX)^-^1[/tex] = C

we are Given [tex]AX(D+BX)^-^1[/tex] = C:

Multiply both sides by (D+BX):

=> [tex]AX(D+BX)^-^1[/tex] * (D+BX) = C * (D+BX)

=> [tex]AX(D+BX)^-^1[/tex] (D+BX)) = C(D+BX)

=> AX * I = CD + CBX

where I is the identity Matrix of size n×n

=> AX = CD + CBX.

Subtract CBX on both sides and factor:

AX - CBX = (CD + CBX) - CBX

=> AX - CBX = CD + (CBX - CBX)

=> AX - CBX = CD + 0

=> (A - CB)X = CD.

Multiply both sides on the left by [tex](A - CB)^-^1[/tex]:

[tex](A - CB)^-^1[/tex] * (A - CB)X = (A - CB)^(-1) * CD

=> ([tex](A - CB)^-^1[/tex]* (A - CB)) X = [tex](A - CB)^-^1[/tex] CD

=> IX = [tex](A - CB)^-^1[/tex] CD

X = [tex](A - CB)^-^1[/tex]CD.

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The median charge is $51. The median of a data set is also called the middle value.

Median is the value of the middle point in a data set. Here is how to find the median.

A sample of the paramedical fees:  $55, $49, $50, $45, $52, and $55. Find the median!

The number of the data is 6.

Let's sort the data form the smallest!

$45, $49, $50, $52, $55, $55

The middle part of the data is $50 and $52. The median is

($50 + $52)/2 = $102/2 = $51

Hence, the median of the data is $51.

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By complex and real number properties, the resulting electric resistance is equal to R' = 47 / 270 + i 4 / 45 ohms.

Complex numbers are numbers of the form z = a + i b, where a, b are real numbers. The first component is the real component and the second one is the complex one. In this problem we find the case of a combination of two electric resistances described by two complex numbers. This expression must be simplified by means of real number and complex number properties:

R' = 1 / R₁ + 1 / R₂

If we know that R₁ = 4 + i 6 and R₂ = 2 - i 4, then the resulting electric resistance is:

1 / (4 + i 6) + 1 / (2 - i 4)

(4 - i 6) / [(4 + i 6) · (4 - i 6)] + (2 + i 4) / [(2 - i 4) · (2 + i 4)]

(4 - i 6) / (16 - i² 36) + (2 + i 4) / (4 - i² 16)

(4 - i 6) / (16 + 36) + (2 + i 4) / (4 + 16)

(4 - i 6) / 52 + (2 + i 4) / 20

(2 - i 3) / 27 + (1 + i 2) / 10

47 / 270 + i 4 / 45

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The percentile score of 71 on test score is 27 and the score of victor is 71.

Statistics is the science concerned with developing and studying methods for collecting, analyzing, interpreting and presenting empirical data.

Given, the teacher recorded unit 4 test scores from class.

The scores are: 5,4,66,70,71,75,77,80,84,85,87,90,93,95 and 96.

A percentile is a value on a scale of one hundred that indicates the percent of a distribution that is equal to or below it.

The percentile rank of a score of 71 on the test is find by formula

[tex]R_{100} =\frac{100(N < )+\frac{1}{2} }{N}[/tex]

=100×4+1/2(1)/15

=400+0.5/15

=400.5/15

=26.7=27th

Now we need to find the score of victor who has 60th percentile.

60=Score/15

score=71

Hence, the percentile score of 71 on this test score is 27 and the score of victor is 71.

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1.1 cm is the 1/360th of the circumference. The circle's circumference is 69.72% of the arc that the angle's rays subtend.

We must comprehend and use the relationships between arc length and circumference in this question. By using geometry, we can determine that a circle's central angle is 360 degrees, and that the circle arc is directly proportional to the central angle.

The angle's rays' subtend an arc that is 69.72% the diameter of the circle.

The circumference's length is multiplied by 1/360 to get the 1/360th of the circumference, and the resulting measurement is

s= 1/360 x 396

= 1.1

the circumference is 1.1 cm.

By dividing the subtended arc by the arc length, one may determine the arc that the angle's subtend rays :

n = 276.1/396 x 100%

n= 69.72%

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Answer:

Step-by-step explanation:

You want the equations of the graphed parallel lines with y-intercepts of 2 and -1, and a rise/run of 3/1.

The slope-intercept form equation with slope m and y-intercept b is ...

  y = mx +b

Each of these lines rises 3 units for each 1 unit to the right, so has a slope of ...

  m = rise/run = 3/1 = 3

The red line crosses the y-axis at y=2, so its equation is ...

  y = 3x +2

The blue line crosses the y-axis at y=-1, so its equation is ...

  y = 3x -1

The definite integral of the function f shown in the graph below, over the limits from 0 to 3.

In the given question, we have to find the definite integral of the function f shown in the graph below, over the limits from 0 to 3.

On the interval [a, b], the definite integral of a real-valued function f(x) with respect to a real variable x is written as

[tex]\int^{b}_{a}f(x)dx = f(b) - f(a)[/tex]

Any function's definite integral can be written as the upper limit of a sum or, if an anti-derivative F exists for the interval [a, b], as the difference between the values at the points a and b.

[tex]\int^{3}_{0}f(x)dx[/tex] = Area under the curve from 0 to 3

[tex]\int^{3}_{0}f(x)dx[/tex] = 1/2 ×3×12

[tex]\int^{3}_{0}f(x)dx[/tex] = 18

Hence, the definite integral of the function f shown in the graph below, over the limits from 0 to 3 is 18.

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0.688 will be the probability of getting a nickel from the jar.

Given,

Probability;-

Simply put, probability is the likelihood that something will occur. When we don't know how an event will turn out, we can discuss the likelihood or likelihood of several outcomes. Statistics is the study of events that follow a probability distribution.

Here,

The number of fortunate situations divided by the total number of coins would be the product between the probability of each occurrence and the likelihood of each event.

Therefore,

P(nickel) = 19/69

P(penny) = 17/68

That is,

P = 19/69 × 17/68

P = 323/4692

P = 0.0688

That is,

The probability of getting nickel from the jar is 0.06888

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there are 15 different ways to form a committee of 6 people from the department if the number of men in the committee is less than the number of females in the committee by combination.

There are 15 different ways to form a committee of 6 people from the department if the number of men in the committee is less than the number of females in the committee. This is because the number of possible combinations of 6 people with varying numbers of men and women is equal to the number of combinations of 6 people with 1 more female than male, plus the number of combinations of 6 people with 1 more male than female (which is equal to the number of combinations of 6 people with 1 more female than male).

Mathematically, this can be expressed as:

Number of combinations = (number of 6-person combinations with 1 more female than male) + (number of 6-person combinations with 1 more male than female)

Number of combinations = (6C4 x 5C2) + (6C5 x 5C1)

Number of combinations = 15

Therefore, there are 15 different ways to form a committee of 6 people from the department if the number of men in the committee is less than the number of females in the committee.

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The situation given in the question occurs due to the lower mortality rate which is seen in women of the age group 50-60.

Discrepancies between men and women's death rates and life expectancy. In general, women live longer than males. This means that, assuming everything else is equal, we should anticipate that women will make up somewhat more than half of the population.

Birth sex ratios are not equal. Males outnumber female births in every country. This means that, assuming everything else is equal, we should anticipate that men will make up somewhat more than half of the population.

The population's gender distribution can be impacted through migration. All other things being equal, we would anticipate that men would make up more than 50% of the population if some countries import a sizable amount of male-dominated labor.

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Answer:

a) 80 pence

b) 6 pence

Step-by-step explanation:

The connection fee is the y intercept of the graph

The cost per minute is the slope of the graph

The equation before the transformation is g(x) = (x - 0.6) - (x - 0.5)

From the question, we have the following function that can be used in our computation:

g(x) = (x - 1.6) - (x - 1.5)

Also, we have:

Transformation = shifted to the right 1 unit

This means that

g(x) = f(x - 1)

So, we have

f(x) = g(x + 1)

Substitute the known values in the above equation, so, we have the following representation

g(x + 1) = (x - 1.6 + 1) - (x - 1.5 + 1)

Rewrite properly

g(x + 1) = (x - 0.6) - (x - 0.5)

So, the equation is g(x) = (x - 0.6) - (x - 0.5)

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The expression for the number of boxes of donuts bought by Ling is d/6.

We are given that -

Ling bought a ' d ' donut to share with a coworker.

There were 6 donuts in each box. This implies that 1 box contains 6 donuts.

Now, let us write the expression for the number of boxes of donuts bought by Ling as follows -

The number of boxes of donuts = the total number of donuts/donuts in 1 box.

Hence, the number of boxes of donuts = d/6

Thus, the expression for the number of boxes of donuts bought by Ling is d/6.

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Answer:

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

Parallel lines have equal slopes.

Given line has a slope of m = 1/5.

Use point-slope form and the coordinates of the point (5, - 4) find the parallel line:

Correct choice is D.

A. Perpendicular

B. Neither

C. Parallel

D. Parallel

E. Parallel

F. Perpendicular

G. Neither

H. Neither

I. Neither

Tom’ mot recent book earned 10*4 time a much money a hi firt book. then The amount that Tom’s most recent book earn is 10^7.

How to illustrate the exponent?

The exponent is the number of times that a number is multiplied by itself. It should be noted that the power is an expression which shows the multiplication for the same number. For example, in 6⁴ , 4 is the exponent and 6⁴ is called 6 raise to the power of 4.

Since Tom’s most recent book earned 10*4 times as much money as his first book which was 10³.

The total amount of the recent book will be:

= 10⁴ × 10³

= 10^(4 + 3)

= 10^7

The amount is 10^7.

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Answer:

No

Step-by-step explanation:

The cost of running six seminars is [tex]10000+1500+6(400+250)=\$15400[/tex].

The revenue earned is about [tex]1500(6)=\$9000[/tex].

Since the revenue is significantly less than the cost, there will not be a profit.

Answer:

A. Same-side interior angles

Step-by-step explanation:

Same-side interior angles are angles that has same-side interior angles sum up to 180 degrees. So, the answer is A.

Answer: A. Same side interior angles

Step-by-step explanation:

because they are inside the parralel lines and they are on the same side of the line going across them

The details of the angles in the diagram used to prove the congruency of the triangles ΔABC ≅ ΔCDA  indicates;

Statements                                               [tex]{}[/tex]   Reasons

1.  ∠D ≅ ∠B                                             [tex]{}[/tex]  1. Given

∠ACB ≅ ∠CAD

2. Therefore; ∠ACD ≅ ∠CAB               [tex]{}[/tex]  2. Angle sum property of a triangle

3.  [tex]\overline{AC}[/tex] ≅ [tex]\overline{AC}[/tex]                             [tex]{}[/tex]               3. Reflexive property

4. ΔABC ≅ ΔCDA   [tex]{}[/tex]                                4. ASA congruency rule

Therefore, the completed flowchart is presented as follows;

∠D ≅ ∠B                   [tex]{}[/tex]              ∠ACB ≅ ∠CAB                [tex]{}[/tex][tex]\overline{AC}[/tex] ≅ [tex]\overline{AC}[/tex]

∠ACB ≅ ∠CAB                       Angle sum property        Reflexive prop

Reason; Given

            [tex]{}[/tex]                             ΔABC ≅ ΔCDA

                                        [tex]{}[/tex]

What are congruent triangles?

Triangles are congruent if the three sides on both triangles are congruent or if two angles and a non included side in one triangle are congruent to two angles and a non included side of the other triangle

The details of the reasons used to prove the ΔABC ≅ ΔCDA are as follows;

Angle sum property of a triangle

The angle sum property of a triangle indicates that the sum of the three interior angles of a triangle is 180°

Reflexive property

Reflexive property of congruency states that a geometric figure is congruent to itself.

ASA congruency rule

The Angle-Side-Angle, ASA, congruency rule states that the if two angles and a non included side of one triangle are congruent to two angles and a non included side of the other triangle, then both triangles are congruent

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Answer: y=-(1/4)x+5

Step-by-step explanation:

(-4,6)   (4,4)

                    [tex]\boxed {\frac{x-x_1}{x_2-x_1}=\frac{y-y_1}{y_2-y_1} }[/tex]

x₁=-4    x₂=4    y₁=6    y₂=4

Hence,

[tex]\displaystyle\\\frac{x-(-4)}{4-(-4)}=\frac{y-6}{4-6} \\\\\frac{x+4}{4+4}=\frac{y-6}{-2} \\\\\frac{x+4}{8} =\frac{y-6}{-2} \\[/tex]

Multiply both parts of the equation by -2:

[tex]\displaystyle\\-\frac{x+4}{4} =y-6\\\\-\frac{1}{4}x -1=y-6\\\\-\frac{1}{4} x-1+6=y-6+6\\\\-\frac{1}{4} x+5=y\\\\Thus,\ y=-\frac{1}{4} x+5[/tex]

Answer:2.8333…

Step-by-step explanation:

you just have to divide

Answer:

lol

Step-by-step explanation:

hahahaha

Answer:

$4950

Step-by-step explanation:

100-45 = 55

55% × 9000 = 4950

The difference in elevation in meters between the points X and Y is 360.

Why are there contour lines?

A contour line is a line drawn on a topographic map to represent a dip or elevation in the ground.

                  The vertical separation or difference in elevation between contour lines is referred to as a contour interval. Every fifth contour line is a set of bold or thicker lines known as an index contour.

Which 3 types of contour lines are there?

There are three different types of contour lines that you might find on a map: supplemental, index, and intermediate. Index lines are the thickest contour lines, and they are frequently numbered at a specific location along the line. You can see the elevation above sea level from this.

Point X is marked on the contour line of 1,600 m. Point Y is marked on the second contour line between the 1,200 m and 1,300 m contour lines, thus:

2 x 20 = 40

So we have 1,240 m. Having the elevations of the two points, we only need to take the lower value from the larger value:

1,600 - 1,240 = 360 m

So we get a result of 360 m of difference in elevation between the points X and Y.

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Answer:

maybe the first answer is 0.035 and the second answer is 0.045

Step-by-step explanation:

Answer:

graph C

Step-by-step explanation:

if x ≥ 0

2x + 1 < 5

2x < 5 - 1

2x < 4

2/2 x < 4/2

x < 2

0≤ x < 2

if x < 0

2 (-x) + 1 < 5

-2x < 5 - 1

-2x < 4

-2/-2 x > 4/-2

x > -2

-2 < x < 0

final solution

-2 < x < 2

By using trigonometry it can be calculated that-

Horizontal distance from the base of the skyscraper out to the ship is 1009.91 feet

What is trigonometry?

Trigonometry shows the relationship between sides and angles of a right angled triangle.

There are six trigonometrical functions. They are

[tex]sin\theta, cos\theta, tan\theta, cot\theta, sec\theta, cosec\theta[/tex]

[tex]sin\theta = \frac{perpendicular}{hypotenuse}\\\\cos\theta = \frac{base}{hypotenuse}\\\\tan\theta = \frac{perpendicular}{base}\\\\cot\theta = \frac{base}{perpendicular}\\\\sec\theta = \frac{hypotenuse}{base}\\\\cosec\theta = \frac{hypotenuse}{perpendicular}\\\\[/tex]

Trigonometry is a very important tool in mathematics.

Trigonometry is used here

Here, a diagram has been attached

Let AB be the skyscraper and C is the position of the boat

Let the horizontal distance from the base of the skyscraper be x feet

Angle of depression = 48°

Height of the observation deck = 1121 feet

[tex]tan 48 = \frac{1121}{x}\\1.11 = \frac{1121}{x}\\x = \frac{1121}{1.11}\\[/tex]

x = 1009.91 feet

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Answer: 1009.35

Step-by-step explanation:

Answer:

Therefore, the value of "a" could be 23 or -7 in order for the two points (-5,8) and (3,a) to be 17 units apart.

Step-by-step explanation:

To find the value of "a" such that the two points (-5,8) and (3,a) are 17 units apart, we can use the distance formula to calculate the distance between the two points.

The distance formula is:

distance = sqrt((x2 - x1)^2 + (y2 - y1)^2)

Plugging in the values for x1, y1, x2, and y2, we get:

distance = sqrt((3 - (-5))^2 + (a - 8)^2)

Simplifying the expression, we get:

distance = sqrt((8)^2 + (a - 8)^2)

distance = sqrt(64 + (a - 8)^2)

Since the distance between the two points is 17 units, we can set the expression equal to 17 and solve for "a":

sqrt(64 + (a - 8)^2) = 17

64 + (a - 8)^2 = 289

(a - 8)^2 = 225

a - 8 = 15 or a - 8 = -15

a = 23 or a = -7

Answer: 23 or -7

Step-by-step explanation:

The distance formula is:

distance = sqrt((x2 - x1)^2 + (y2 - y1)^2)

Plugging in the values for x1, y1, x2, and y2, we get:

distance = sqrt((3 - (-5))^2 + (a - 8)^2)

Simplifying the expression, we get:

distance = sqrt((8)^2 + (a - 8)^2)

distance = sqrt(64 + (a - 8)^2)

Since the distance between the two points is 17 units, we can set the expression equal to 17 and solve for "a":

sqrt(64 + (a - 8)^2) = 17

64 + (a - 8)^2 = 289

(a - 8)^2 = 225

a - 8 = 15 or a - 8 = -15

a = 23 or a = -7

Answer:

Step-by-step explanation:

d.) y=-x+2 and y=x+17

I graphed these system of equations on Desmos and the first 3 showed that the lines are parallel meaning they will never touch meaning that they won't have a solution or that they won't intercept. And for the last one, when I entered the equations it showed the interception, which is (-7.5, 9.5)

(Hopefully this is right)

Answer: B

Step-by-step explanation:

Let's pick 2 points ( 0,80) ( 5, 70)

The rate of change or slope is rise/run

We see that the y decrease by 10 and x increases by 5, so the slope is

-10/5 = -2 ft/s

So the aswer is B