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2 years ago

Someone please help me !!! i need it by 7:30!! ammm!!!

Mathematics

1 answer:

AveGali [126]2 years ago

8 0

Answer:

LON and MLN are both equal to 126 degrees,

since the angles with the value '4x + 7' and '7x - 35' degrees are equal to each other, you can rewrite it like this:

4x+7=7x-35

now, take the 7x away from both sides:

-3x+7=-35

then, subtract 7 from both sides:

-3x=-42

now, divide both sides by -3:

x=14

now that we know the value of x (14), we can plug it into the expressions.

4(14)+7=63

7(14)=63

add them together to find the angle MLN

and since the opposite angle (LON) is equal to MLN, they both = 126 degrees

hope this helped :)

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If the original rectangle has an area of 2 cm squared and the scaled copied has an area of 50 cm squared what is the scale facto

vazorg [7]

Answer:

The scale factor used to draw the scaled copy is a factor of 5

Step-by-step explanation:

Here, we are interested in calculating the scale factor which was used to transition the original rectangle to the new scaled copy.

Firstly, there is a way to relate how the scale factor of the sides relate to the scale factor of the area. What we are saying here is that the scale factor of the sides is never equal to that of the area;

For a 2 cm^2 area let’s say the sides are 1 by 2 ; this gives us an area as said

Now, to get 50cm^2, we can see that the scale factor of both areas is 25 (2 to 50)

So the area has been scaled 25 times the original area. So how has the sides been scaled?

Using a general principle, the scale used to scale the area is the square of the scale used to scale the sides. What are we saying here? if the area is scaled by 4, then the sides are scaled by 2

So in this particular case, the area is scaled by a factor of 25

Now, the scale factor of the sides will be the positive square root of this which is 5

Hence, we can conclude that the sides of the smaller triangles were each multiplied by 5 to arrive at the sides of the bigger one which makes it that the scale factor used to draw the scaled copy is 5

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4 years ago

Which beat explains what determines whether a number is irrational?

lisov135 [29]

Answer:

The correct answer is Choice D. An irrational number is a number that can be written as a decimal but never terminates or repeats.

A good example of an irrational number is the number pi. We know that it begins as 3.14. However, that is only the beginning. It goes on forever without repeating or terminating.

Step-by-step explanation:

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3 years ago

A trumpet has a length of 140cm. The first valve lowers the root note by two semitones (f1/f0 = 2-2/12) and the second valve low

Alexxandr [17]

Answer:

a. 17.145cm

b. 8.325cm

c. 0.846

d. 2.896

Step-by-step explanation:

It is known that frequency is inversely proportional to length.

Case 1: The player presses only the first valve.

f₁/fo = 2^{-2/12} = lo/l₁

given that lo= 140cm.

l₁ = 2^{2/12}lo = 157.145

change in length:

l₁ - lo = 157.145 - 140 = 17.145cm

Case 2: The player presses only the second valve.

f₂/fo = 2^{-1/12} = lo/l₂

l₂ = 2^{1/12}lo = 148.325cm

l₂ - lo= 148.325-140 = 8.325cm

Case 3: The player presses both the first and second valve.

Change in length is the sum of change in length when they are individually pressed.

l₃ - lo = 17.145+8.325 = 25.47cm

l₃ = 25.47cm+lo = 165.47cm

f₃/fo = 2^{-n/12} = lo/l₃

f₃/fo = 2^{-n/12} = 140/{165.47 = 0.846

2^{-n/12} = 0.846\Rightarrow n/12 = -log(0.846)/log(2) = 0.2413

n = 0.2413*12 = 2.896

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3 years ago

How can you use a right angle to determine the classification of another angle

zimovet [89]

Since a right angle is 90 degrees you can classify other angles by seeing if they are less or greater than a 90 degree angle.If it's less than 90 degrees its an acute angle.If it is greater than 90 than its obtuse but its less than 180.180 is a straight angle

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4 years ago

3m -9n = 24; n = - 1,1,3

Ghella [55]

given that

3m -9n =24

when n= -1

substitute it in the equation

thus

3m -9(-1)=24

solving for m

3m +9 =24

3m =24-9

3m=15

dividing through by 3

3m/3 =15/3

m =5 . thus when n= -1 , m=5

also put n=1 into the equation

3m -9(1) =24

3m -9 =24

3m= 24+9

3m =33

dividing through by 3

3m/3 = 33/3

m=11

thus when n= 1, m=11

lastly, put n= 3 into the equation

3m -9(3) =24

3m -27 = 24

3m = 24+27

3m =51

dividing through by 3

3m/3 =51/3

m =17. Thus when n = 3 , m= 17.

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3 years ago