find the value of X.
L,M∈KN

Find The Value Of X.L,MKN

Answers

Answer 1
We know:
Angles on a straight line sum to 180 degrees, so we can calculate OLM and OML, OLM will be 180 - 134, and OML will be 180 - 84. These are both 46 and 96. We also know that three angles in a triangle sum to 180 degrees, therefore 46 + 96 + x = 180, or 142 + x = 180, so x = 38 degrees
Answer 2
the answer is x=38 degrees

Related Questions

Identify the independent variable and the dependent variable. A pool store owner wants to determine the effect of algaecide brands on the treatment of pool water with algae. He contacts customers who have purchased the brands of algaecide and asks their opinion of the algaecide.

Answers

The independent variable is the brand of algaecide. The dependent variable is the treatment of pool water with algae.

What is the independent and dependent variable?

In mathematical modeling, statistical modeling, and experimental sciences, there are dependent and independent variables. Dependent variables get their name because, during an experiment, their values are investigated under the presumption or requirement that they are dependent on the values of other variables due to some law or rule.

Here, we have

Given

A pool store owner wants to determine the effect of algaecide brands on the treatment of pool water with algae. He contacts customers who have purchased the brands of algaecide and asks their opinion of the algaecide.

We have to determine the independent variable and the dependent variable.

We concluded that the independent variable is the brand of algaecide and the dependent variable is the treatment of pool water with algae.

Hence, the independent variable is the brand of algaecide and the dependent variable is the treatment of pool water with algae.

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Is maths hard or easy?

Answers

Maths can be hard or easy, depending on the level of difficulty and the individual's experience and understanding numbers.

Maths is a subject that can range in difficulty depending on the level of complexity and the individual's experience and knowledge. Some people may find it easy, while others may find it difficult. In the end, it all depends on the level of understanding and the amount of effort put into learning and practicing.

Maths can be hard or easy, depending on the level of difficulty and the individual's experience and understanding numbers

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Answer:

BOTH!

Step-by-step explanation:

See math can be easy or hard. It all depends on YOU. The equation itself isn't hard at all. Mybe a little more work to put in. but its your brain that tells you comething is too challenging or too hard. Now if you are a straight A students and you love math then ofcource your going to be like this is easy!

-50 POINTS- (Curtisqn don’t even try you’re slow.)

SSS
SAS
ASA
SAA
HL

Answers

ASA because the top have angles that are congruent same with the bottom and the middle is a congruent side that the triangles share

B is the circumcenter of △ADG. find AE and DG​

Answers

When B is the circumcenter of  triangle ADG the lengths of AE and DG are 4 and 12 respectively

What is circumcenter in a triangle?

The intersection of the perpendicular bisectors of a triangle's sides is known as the circumcenter of that particular triangle.

In other terms, the circumcenter is the point at which the bisector of a triangle's sides coincides.

The perpendicular lines radiating from the sides of the triangle are the bisectors hence the line it radiates from shares the is shared into two halves at that point

Having this in mind

AE = DE = 4

and

DF = GF = 6

Also, DF + GF = DG

DG = DF + DF

DG = 6 + 6

DG = 12

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How do you find the value of 3 7?

Answers

Answer:2.3 repeating

Step-by-step explanation:7/3 and if it goes in a inf loop it's a repeating

Can you help me with this

Answers

slope is 1
there’s no equation of the line because the slope of the line is 1

N plus 75 used in a real world sentence.

Answers

Answer:

Laura has "n" amount of nickels. She receives 75 more from her grandmother.

Explanation:

(If this is not what the question meant, please let me know!)

Because the question is asking us to write a sentence for an addition problem, we need to write a sentence that involves two amounts of one thing being combined, in this case nickels.

I don´t understand the last one

Answers

The horizontal distance that the boat is from the lighthouse is 920.31 feet

What is an equation?

An equation is used to show the relationship between numbers and variables.

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

A beacon light is 113 feet above the water. The angle of elevation to the beacon is 7 degrees.

Let d represent the horizontal distance from the house.

Using trig ration:

tanФ = opposite/adjacent

Substituting:

tan(7) = 113 / d

d = 920.31 feet

The horizontal distance is 920.31 feet

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convert y=2(x-5)(x+2) into standard form

Answers

Answer:

Step-by-step explanation:

y=2x-5+2

then you do minus 2 on both sides

Hope this helped!

What is the rate of change for y= 0.75-2?

Answers

Answer:

The slope is 0.75.

The equation is y=0.75x-2

Step-by-step explanation:

- 6 <1/3(6y + 12) < 14

Answers

Answer:

1 - 5 < y < 5

I hope you pass your assignment

The range of solutions for the given inequality is -5<y<5.

What are inequalities?

Inequalities are the mathematical expressions in which both sides are not equal. In inequality, unlike in equations, we compare two values. The equal sign in between is replaced by less than (or less than or equal to), greater than (or greater than or equal to), or not equal to sign.

The given inequality is -6<1/3(6y + 12)<14.

Here, -6<(2y + 4)<14

-6<(2y + 4)

Subtract 4 on both the sides of an inequality, we get

-10<2y

Divide 2 on both the sides of an inequality, we get

-5<y

(2y + 4)<14

Subtract 4 on both the sides of an inequality, we get

2y<10

Divide 2 on both the sides of an inequality, we get

y<5

So, -5<y<5

Therefore, the range of solutions for the given inequality is -5<y<5.

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Can you let me know the answer please

Answers

Answer:

The answer is A

Step-by-step explanation:

When looking at this image, look at A, notice how it says y and the equal to symbol is facing it? then notice at the end of answer a is -4, look at the graph and the line intercepts -4, remeber, the end number, whether positive or negative will always be the on the y axis

What are the zeroes of the polynomial 4x2 4x 3?

Answers

The zeroes of this polynomial equation is [tex]$4 x^2-4 x-3$[/tex] are [tex]\frac{3}{2}$[/tex] and [tex]$-\frac{1}{2}$[/tex].

First form the equation

As per the given data the given polynomial equation is [tex]$4 x^2-4 x-3$[/tex].

Here we have to determine the zeroes of a polynomial equation is [tex]$4 x^2-4 x-3$[/tex].

We know that the zeroes of a polynomial are evaluated by equating them with zero.

Therefore p(x)=0

[tex]& \Rightarrow 4 x^2-4 x-3=0[/tex]

Then solve to find the zeroes

[tex]& 4 x^2-4 x-3=0 \\[/tex]

[tex]& \Rightarrow 4 x^2-6 x+2 x-3=0 \\[/tex]

2x(2x - 3) + 1(2x - 3) = 0

(2x - 3) (2x + 1) = 0

[tex]& \Rightarrow x=\frac{3}{2},-\frac{1}{2}[/tex]

Then do verification

We know that for a given polynomial [tex]$a x^2+b x+c$[/tex]

Sum of the zeroes [tex]$=-\frac{b}{a}$[/tex] and product of the roots [tex]$=\frac{c}{a}$[/tex]

Sum of the zeroes [tex]$=\frac{3}{2}-\frac{1}{2}=1$[/tex]

Again, [tex]$-\frac{b}{a}=\frac{4}{4}=1$[/tex]

Product of the zeroes [tex]$=\frac{3}{2} \times-\frac{1}{2}=-\frac{3}{4}$[/tex]

Again, [tex]$\frac{c}{a}=-\frac{3}{4}$[/tex]

Thus, the relationship between the zeroes and the coefficients of the polynomial is verified.

Hence, the zeroes of this polynomial are [tex]\frac{3}{2}$[/tex] and [tex]$-\frac{1}{2}$[/tex].

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2. A Grade 12 student is taking Biology, English, Math, and Physics in her first term. If a student timetable has room for five courses (meaning the student has a spare), how many ways can she schedule her courses

Answers

The schedule of her course in 120 ways.

How to calculate how many ways can she schedule her courses?

A finite collection of symbols that are properly created in line with context-dependent criteria is referred to as an expression, sometimes known as a mathematical expression. Operations include addition, subtraction, multiplication, and division.

A mathematical expression is the collection of mathematical symbols that results from the proper combination of numbers and variables using operations like addition, subtraction, multiplication, division, exponentiation, and other as-yet-unlearned operations and functions.

The three different types of algebraic expressions are monomial, binomial, and polynomial.

According to the question there are five spaces for different subjects which are arranged in different order so the number of ways are

2(5,4)

= 5 * 4 * 3 *  2

=120 ways

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(25 points for the answer)
If John save 1/5 of his paycheck how much money would it take him to get to 14,500$ for his holiday trip? He earns $9062.5 each paycheck. (Unrealistic question unless you are under paid severely)

Use multiplication or division ONLY!

Answers

The amount of john would save 2900 rs

14500*1/5=2900

How much he earns on paycheck?A paycheck, also spelled paycheque, pay check or pay cheque, is traditionally a paper document issued by an employer to pay an employee for services rendered.a check used to pay an employee the amount of money the employee has earned.A paycheck can be an actual piece of paper (a check) that a person can take to the bank to deposit to their account or exchange for cash. Alternatively, a paycheck can be money a company electronically deposits directly into the employee's bank account.Take a look at how each common payroll interval works: Weekly: Once a week (52 paychecks per year) Biweekly: Once every other week (26 paychecks per year) Semimonthly: Twice per month (24 paychecks per year

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Given:
sin (C) 4/9

Find tan (C)

Answers

[tex]sin(C)=\cfrac{\stackrel{opposite}{4}}{\underset{hypotenuse}{9}}\qquad \textit{let's find the \underline{adjacent side}} \\\\\\ \textit{using the pythagorean theorem} \\\\ c^2=a^2+b^2\implies \sqrt{c^2 - b^2}=a \qquad \begin{cases} c=hypotenuse\\ a=adjacent\\ b=opposite\\ \end{cases} \\\\\\ \sqrt{9^2 - 4^2}=a\implies \sqrt{65}=a \\\\[-0.35em] ~\dotfill[/tex]

[tex]tan(C)=\cfrac{\stackrel{opposite}{4}}{\underset{adjacent}{\sqrt{65}}}\implies tan(C)=\cfrac{4}{\sqrt{65}}\cdot \cfrac{\sqrt{65}}{\sqrt{65}}\implies tan(C)=\cfrac{4\sqrt{65}}{65}[/tex]

Identify the range of the function shown in the graph.

Answers

the range of the function shown in the graph -1 [tex]\leq[/tex] y[tex]\leq[/tex] 1.

What is the sine and cosine graph's range?

All real numbers fall within the domain of the sine and cosine functions. Both the sine and cosine functions have a range of [1,1]. An angle's sine and cosine have the same absolute value as their respective reference angles.

What is a cosine graph's range?

An illustration of the function's range in the graphs of cos and sine

The cosine function's graph appears as follows: The range of the function y=cos(x) is 1y1, and the domain is all real numbers (cosine is defined for any angle measure).

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A "Pick 2" lottery game involves drawing 2 numbered balls from separate bins each containing balls labeled from 0 to 9. So there are 100 possible selections in total: 00, 01, 02, ..., 98, 99. Players can choose to play a "straight" bet, where the player wins if they choose both digits in the correct order. Since there are 100 possible selections, the probability a player wins a straight bet is 1/100. The lottery pays $50 on a successful $1 straight bet, so a player's net gain if they win this bet is $49. Let X represent a player's net gain on a $1 straight bet. Calculate the expected net gain E(X). Hint: The expected net gain can be negative. E(X) = dollars

Answers

The expected net gain E(X) in the context of this problem is given as follows:

E(X) = -$0.5.

How to obtain the expected net gain?

The net gain for this problem is modeled for a discrete distribution, as there are only two possible outcomes, given as follows:

Winning $49.Losing $1.

The probability of winning is of 1% = 0.01, while the probability of losing is of 99% = 0.99, hence the distribution of gains for this problem is given as follows:

P(X = -1) = 0.99.P(X = 49) = 0.01.

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

Hence the expected net gain for this game is calculated as follows:

E(X) = -1 x 0.99 + 49 x 0.01.

E(X) = -$0.5.

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What is the area when the diameter is 16?

Answers

201.06 square units (rounded to 2 decimal places) is the area of the given circle.

The formula for the area A of a circle is A = πr², where r is the radius of the circle and π is the famous, well-known irrational number pi equal to 3.14159 (rounded to 5 decimal places).

Given that the circle's diameter is 16, and that a circle's radius is equal to half its diameter, the following conclusions can be drawn:

r = d/2

= 16/2

= 8

A=πr2

AND HALF THE DIAMETER IS THE RADIUS (r)

r=8

A= πr2 = π (8) squared = 64 * π = 200.96

or,

Now, substituting the values of r and π into the formula for the area of a circle, we get

A = πr²

= (3.14159)(8²)

= (3.14159)(64)

= 201.06 square units (rounded to 2 decimal places) is the area of the given circle.

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Trapezoid LMNO with bases LM and ON , and Median PQ

If PQ = t +6, LM = t +3 and ON = 3t – 7, find ON

Answers

The length of base ON of trapezoid LMNO is 17 units

We know that the median theorem of trapezoid, which states that the median of a trapezoid is parallel to each base. Also, the length of the median equals one-half the sum of the lengths of the two bases.

Consider the following diagram of trapezoid LMNO with bases LM and ON , and Median PQ.

Given that the equations for the bases and median of trapezoid LMNO .

PQ = t +6, LM = t +3 and ON = 3t – 7

From above theorem,

PQ = 1/2 (LM + ON)

t + 6 = 1/2 ( t + 3 + 3t - 7)

2(t + 6) = 4t + 3 - 7

2t + 12 = 4t - 4

4t - 2t = 12 + 4

2t = 16

t = 8 units

So, ON = 3t - 7

ON = 3(8) - 7

ON = 24 - 7

ON = 17 units

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I would like help with this, please. Someone give me an answer in the next day or two.

Answers

Answer:

one solution

Step-by-step explanation:

The two lines cross at exactly one point.  That means there is one solution.

y=5/4x-2 y=5/4x-1 !HELP ME GRAPH AND ANSWER THE QUESTION!!

Answers

Answer:

Y=54x−2y=54x−1

I hope this helps you!

What is 2 step used for?

Answers

The two step equations are used to represent the equations and solve real life problems .

What is Two Step Equations ?

The Equations that can be solved in exactly two steps are called as Two Step Equations .

We can use the two-step equations to represent and solve real-world problems by translating the problem into an algebraic equation, and solving equation, and then interpreting the solution of equation.

An example of the two step equation is : If a rental car costs $40 plus extra 10 cents for every mile driven, then how many miles can be driven for $50 ?

Translating The problem into equation we get  [tex]40 + 0.1m = 50[/tex] where m is  number of miles driven.

Step(i) we Subtract 20 from both sides

we get , [tex]0.1m = 10[/tex].

Step(ii) We Divide both sides by 0.1 ;

we get , [tex]m = 100[/tex].

Therefore , the problem to find the number of miles is solved in exactly two steps .

The given question is incomplete , the complete question is

What is the two step equation used for ?

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4. The table gives the height and shoe sizes of six randomly selected men.
Height 67 70 73. 5 75 78 66

Shoe size 8. 5 9. 5 11 12 13 8 CO

a. What is the equation of line of best fit: 4= 42x-19. 81

b. What is the slope, and what does it mean in this problem?

C. What is the y intercept? What does it mean in this problem?

d. Using the equation of the line of best fit, if a man has a shoe size of 10. 5, what would be his predicted height?​

Answers

The predicted height if the man with shoe-size 10 is 427.09 cm.

We get the answers using the following steps.

a. The equation of the line of best fit is: y = 42x - 19.81

b. The slope, 42, represents the rate of change of the height variable with respect to the shoe size variable. It means that for every 1-unit increase in shoe size, we can expect a 42-unit increase in height.

c. The y-intercept, -19.81, is the point where the line of best fit crosses the y-axis. It represents the height when the shoe size is 0. It means that if a man has 0 shoe size, his height would be -19.81, both of which is impossible.

d. To predict the height of a man with a shoe size of 10.5, we substitute x = 10.5 into the equation of the line of best fit:

y = 42x - 19.81

y = 42(10.5) - 19.81

y = 447.9 - 19.81

y = 427.09

So, a man with a shoe size of 10.5 would have a predicted height of 427.09 cm

It's worth noting that this is just a predicted value and it might not be accurate. The line of best fit is calculated based on the given data set, it might not be accurate for other data points.

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Find the values of x and y.
-2x+y=-35
L
to
||
2x°
(y + 10)°
yᵒ

Answers

Answer:

x = 60 , y = 85

Step-by-step explanation:

assuming the figure is a trapezoid

• each lower base angle is supplementary to the upper base angle on the same side.

x + 2x = 180

3x = 180 ( divide both sides by 3 )

x = 60

and

y + y + 10 = 180

2y + 10 = 180 ( subtract 10 from both sides )

2y = 170 ( divide both sides by 2 )

y = 85

How do you solve for asymptotes?

Answers

There are three types of asymptotes solved in the following way:

1. Horizontal asymptotes is y = k  for x→∞ and x→ -∞ , when degree of denominator > degree of numerator.

2. Vertical asymptote is x = k for y→∞ and y→ -∞ , when degree of denominator < degree of numerator.

3. Slant asymptotes is y = mx + c.

Asymptote is the representation of the line which approaches to the given curve but never touch or meet with the curve.Three types of asymptotes : Horizontal asymptote, vertical asymptote, and the slant asymptote.1. Horizontal asymptotes is y = k  for x→∞ and x→ -∞ , when degree of denominator > degree of numerator. 2. Vertical asymptote is x = k for y→∞ and y→ -∞ , when degree of denominator < degree of numerator. 3. Slant asymptotes is y = mx + c.Horizontal asymptote rarely cross the given curve but vertical asymptote never.Slant asymptote represents the slope of the function.

Therefore, the three types of asymptotes solved in the following way:

1. Horizontal asymptotes is y = k  for x→∞ and x→ -∞ , when degree of denominator > degree of numerator.

2. Vertical asymptote is x = k for y→∞ and y→ -∞ , when degree of denominator < degree of numerator.

3. Slant asymptotes is y = mx + c.

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PLEASE HELP ME I DONT UNDERSTAND :(( GIVIN 100 POINTS

Question 1: The Magnolia trees purchased for planting at the school are 3 feet tall. Research shows that these types of trees grow at an average of 3/4 foot per year

) Some students misunderstood question #1 and wrote the following equations in point-slope form:
a) y − 3 = 3/4(x-0)
b) y - 6 = 3/4(x-4)
c) y - 4.5 = 3/4(x-2)
d) y - 12 = 3/4(x-12)
(e) y - 15= 3/4(x-15)

Is this equation okay to use for the height of the trees in this problem?

There is one equation that is incorrect.... determine which one? why is it incorrectly?

Creat two new equations written in point slope form​

Answers

The equation in option e) is not correct because it would not give correct height of the trees in this problem

How to write equation in slope-point form?

Since the Magnolia trees are 3 feet tall and grow at an average of 3/4 foot per year.

If x is the number of years and y is the height. we can write:

y = 3/4(x) + 3

The slope-point equation of a line is given as:

y-y1 = m(x−x1)

y = 3/4(x) + 3 in slope-point  form is:

y = 3/4(x) + 3

y-3 =  3/4(x-0)

This means option a) is correct

Yes, this equation is okay to use for the height of the trees in this problem

b) y - 6 = 3/4(x-4)

y - 6 = 3/4(x-4)

y - 6 = 3/4(x)- 3

y - 6 + 3 = 3/4(x)

y - 3 = 3/4(x)

This is correct

c) y - 4.5 = 3/4(x-2)

y - 4.5 = 3/4(x-2)

y - 4.5 = 3/4(x)- 1.5

y - 4.5 + 1.5 = 3/4(x)

y - 3 = 3/4(x)

This is correct

d) y - 12 = 3/4(x-12)

y - 12 = 3/4(x-12)

y - 12 = 3/4(x) - 9

y - 12 + 9 = 3/4(x)

y - 3 = 3/4(x)

This is correct

(e) y - 15= 3/4(x-15)

y - 15= 3/4(x-15)

y - 15= 3/4(x)-11.25

y - 15 + 11.25= 3/4(x)

y - 3.75 = 3/4(x)

This is not correct because it does not reflect the given information

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A cooker is priced at £80 after a 20% reduction from the original price.

Answers

Answer: original price: £400

Step-by-step explanation:

20/100 × original price = £80

Original price = £80 ÷ 20/100

                      = £400

What is the area of the shaded region?

6 mm

21 mm2

24 mm

42 mm

48 mm2

4 mm

3 mm

2 mm

5 mm

Answers

Answer:

The area of the shaded region is, [tex]24mm^{2}[/tex]

Step-by-step explanation:

First we have to calculate the area of ΔABC and ΔXYZ.

Area of ΔABC = [tex]\frac{1}2}[/tex]×[tex]Base[/tex]×[tex]Height[/tex]

Area of ΔABC = [tex]\frac{1}{2}[/tex]×[tex]5mm[/tex]×[tex]12mm[/tex]

Area of ΔABC =[tex]30mm^{2}[/tex]

and,

Area of ΔXYZ = [tex]\frac{1}{2}[/tex]×[tex]Base[/tex]×[tex]Height[/tex]

Area of ΔXYZ = [tex]\frac{1}{2} X3mmX4mm[/tex]

Area of ΔXYZ = [tex]6mm^{2}[/tex]

Now we have to calculate the area of the shaded region.

Area of the shaded region = Area of ΔABC - Area of ΔXYZ

Area of the shaded region = [tex]30mm^{2} - 6mm^{2}[/tex]

Area of the shaded region = [tex]24mm^{2}[/tex]

Therefore, the area of the shaded region is, [tex]24mm^{2}[/tex]

Can someone please help me with this I'm not great with math.

The width of a rectangle is unknown. The length of the rectangle is two more units than its width.

Write a simplified algebraic expression for the area of the rectangle in terms of width (w).

Write your answer in descending order with no spaces. Use w as your variable and use ^ infront of exponents

Answers

The algebraic expression for area of rectangle in terms of width(w) is w^2+2w.

What is algebraic expression?

In mathematics, an expression that incorporates variables, constants, and algebraic operations is known as an algebraic expression (addition, subtraction, etc.).

The expressions are mainly of 4 types that includes:

Monomial Expression: These expressions have only one term.Binomial Expression: These expressions have two terms.Trinomial Expression: These expressions have three terms.Polynomial Expression: These expressions have many terms.

Let the width be w.

So, length of rectangle will be w+2

Now, area of rectangle is length*width

Area= (w+2)*w

= w^2+2w

Hence, a simplified algebraic expression for the area of the rectangle in terms of width (w) is w^2+2w.

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What element has the largest radius? 4x - 20x = -21???????? What was the impact of the printing press on human communication? what you do if you see typo in massage Find the missing measure. Round to the nearest tenth (first decimal place)1526x to digital flash drives for $150 plus the cost of the drives. The mailbox rule will not apply if Kathryn accepts the offer by Lorraine prepared a 1.5-gallon pot filled with tomatoes to be canned in jars. Each jar will hold 1.5 quarts of tomatoes. If 1 gallon equals 4 quarts, how many jarscan Lorraine fill?A.) 03 jarsB.)O4 jarsC.)05 jarsD.)O8 jars The tendency of the media to make coverage and programming decisions based on what will attract a large audience and maximize profits is known as ______. If the absolute temperature of an object is tripled, the thermal power radiated per unit surface area of this object will (assuming that its emissivity is not affected by the temperature change)?Answer: increase by a factor of 81 Spanish 3, fill in the blanks Which type of wave is used in sonar to detect objects?(1 point) What is the following sum? N(t) = 8950 times (0.7)^2t The Cessna Cardinal, a single-engine light plane, has a wing with an area of 16. 2 m^2, and an aspect ratio of 7. 31. Assume the span efficiency factor is 0. 62. A. If the airplane is flying at standard sea-level conditions with velocity of 251 km/h, what is the induced drag when the total weight is 9800N b. Calculate the induced drag when the Which of these is the absolute value parent function?A. f(x) = xOB. f(x) = 2OC. f(x) = xOD. f(x) = Ixl Group the items according to the type of respiration they describe. The items:Carbon dioxide by-productProduces ATPUses oxygenFermentationTakes place within cellsDoes not use oxygenType of respiration:AerobicBothAnaerobic In a circle, an angle measuring 5. 5 radians intercepts an arc of length 8. 4. Find the radius of the circle to the nearest 10th. If mA = 29, mB = 84, and c = 14, what are the measures of the remaining sides and angle? During a fundraiser, Kate wants to sell the same number of $5 candy bars as $2 candy bars. The expression that represents how much money Kate will collect is . Identify any variables, constants, and coefficients and explain what they mean in terms of the expression representing this scenario. Mike is saving money for a new bike that costs $180.00If represents the amount of money he has saved so far, which expression represents the amount of money,in dollars, he still needs to save?A180+m180+m180+m B180m180-m180m C180m180\times m180m D180m180\div m180m