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DanielleElmas [232]
3 years ago
11

I need help with this question asap pleaseeeeee

Mathematics
2 answers:
Harman [31]3 years ago
6 0

Answer:

y = 3\sqrt{7}

Step-by-step explanation:

The two inner right triangles are similar, thus the ratios of corresponding sides are equal, that is

\frac{y}{9} = \frac{7}{y} ( cross- multiply )

y² = 63 ( take the square root of both sides )

y = \sqrt{63} = \sqrt{9(7)} = \sqrt{9} × \sqrt{7} = 3\sqrt{7}

makkiz [27]3 years ago
3 0
You can use the pythagorian theorem here:
The corner on the top side is 90 degrees too. So that means (9+7)^2 = A^2 + B^2. The two triangles against each other are the same, but bigger. That means that the left side is 9/16 out of the whole and the right side is 7/16 out of the whole So back to the pythagorean theorem (9+7)^2 = 256. Multiply that number by one of the two numbers before. I will take 9/16, the left side. 256x9/16 = 144. Take the square root of that, 12, and then you have the length of that side. Then use pythagorean theorem again. C^2 = 9^2 + 12^2
C^2 = 225.
C= 15
Seen as C stands for y, there is your answer
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the length of a rectangular picture frame is 3 centimeters less than twice the width. the perimeter is 78 centimeters. find the
Natalka [10]
Let the width be x
width = x
length = 2x - 3

Perimeter = x + 2x - 3 + x + 2x - 3 = 6x - 6 

6x - 6 = 78
6x = 78 + 6
6x = 84
x = 14 cm

2x - 3 = 2(14) - 3 = 25cm

The width is 14cm and the length is 25cm 
5 0
3 years ago
3z^2-4z+11 -(12z^2+2z-11 find the difference . polynomials functions
Brrunno [24]

Answer:

−135z

2

−2z
The 2 is representing Square

Step-by-step explanation:

(3z)
2

−4z+11−(12z)
2

+2z−11

Expand (3z)

2

.

3

2

z

2

−4z+11−(12z)

2

+2z−11

Calculate 3 to the power of 2 and get 9.

9z

2

−4z+11−(12z)

2

+2z−11

Expand (12z)

2

.

9z

2

−4z+11−12

2

z

2

+2z−11

Calculate 12 to the power of 2 and get 144.

9z

2

−4z+11−144z

2

+2z−11

Combine 9z

2

 and −144z

2

 to get −135z

2

.

−135z

2

−4z+11+2z−11

Combine −4z and 2z to get −2z.

−135z

2

−2z+11−11

Subtract 11 from 11 to get 0.

−135z

2

−2z

6 0
2 years ago
Can someone please help me
stellarik [79]

Answer: A, D, and E

Step-by-step explanation:

Basically, you want to divide each of these answers by 5. Which ever one gives you a solid number (meaning no decimals) then that would be one option.

Hope this helps!

7 0
3 years ago
Hurry hurry hurry hurry 50 points help plz help...it would be better if you have a picture..plz use steps
Ymorist [56]

Our goal here is to create a copy of line segment PQ, through various steps. Let's start with drawing line segment PQ, respectively point R a fixed distance away from the segment.

It would be wise to use a compass in this case, and a ruler for certain.

So we have this segment PQ, and point R a " fixed distance " away from PQ.

( 1. Extend a compass to match with the length of PQ,

( 2. Move this compass ( without changing it's length ) so that one endpoint matches with point R

( 3. Now draw an arc with this compass, where this line will be

( 4. Take your ruler and draw a straight line from this point R to your arc. It would be wise to draw this line to the middle of the arc you created.

If you like, take a look at the attachment below to see what it should look like.

I have done these questions before, so I can assure you that this experiment is proved correctly!

8 0
3 years ago
the average marks of the first 10 students are 17 and that of the next 15 students is 18. find the mean of 25 students?
Alex787 [66]

Answer:

20

_____

10 = 17

15 = 18

20 = 19

25 = 20

6 0
3 years ago
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